Fujifilm GFX 100RF vs Pentax K-3 III
The Fujifilm GFX 100RF and the Pentax K-3 III are two enthusiast cameras that were announced, respectively, in March 2025 and March 2021. The GFX 100RF is a fixed lens compact, while the K-3 III is a DSLR. The cameras are based on a medium format (GFX 100RF) and an APS-C (K-3 III) sensor. The Fujifilm has a resolution of 101.8 megapixels, whereas the Pentax provides 25.6 MP.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Check GFX 100RF price at
amazon.com

Check K-3 III price at
amazon.com
Going beyond this snapshot of core features and characteristics, what are the differences between the Fujifilm GFX 100RF and the Pentax K-3 III? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.
Body comparison
The side-by-side display below illustrates the physical size and weight of the Fujifilm GFX 100RF and the Pentax K-3 III. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All size dimensions are rounded to the nearest millimeter.
Both cameras are available in two different colors (black, silver).



If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax K-3 III is notably larger (16 percent) than the Fujifilm GFX 100RF. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.
The above size and weight comparisons are to some extent incomplete and possibly misleading, as the GFX 100RF has a lens built in, whereas the K-3 III is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup.
Concerning battery life, the GFX 100RF gets 820 shots out of its Fujifilm NP-W235 battery, while the K-3 III can take 800 images on a single charge of its Pentax D-LI90 power pack. The power pack in the GFX 100RF can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.
The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

| Camera Model |
Camera Width |
Camera Height |
Camera Depth |
Camera Weight |
Battery Life |
Weather Sealing |
Camera Launch |
Launch Price |
Street Price |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Fujifilm GFX 100RF | 134 mm | 90 mm | 77 mm | 735 g | 820 | Y | Mar 2025 | US$ 4 899 | amazon.com | |
| 2. | Pentax K-3 III | 135 mm | 104 mm | 74 mm | 820 g | 800 | Y | Mar 2021 | US$ 1 999 | amazon.com | |
| 3. | Canon R5 C | 142 mm | 101 mm | 111 mm | 770 g | 320 | Y | Jan 2022 | US$ 4 499 | amazon.com | |
| 4. | Fujifilm GFX 50R | 161 mm | 97 mm | 66 mm | 775 g | 400 | Y | Sep 2018 | US$ 4 499 | ebay.com | |
| 5. | Fujifilm GFX 100S II | 150 mm | 104 mm | 87 mm | 883 g | 530 | Y | May 2024 | US$ 4 999 | amazon.com | |
| 6. | Fujifilm X100V | 128 mm | 75 mm | 53 mm | 478 g | 420 | Y | Feb 2020 | US$ 1 399 | ebay.com | |
| 7. | Fujifilm X100VI | 128 mm | 75 mm | 55 mm | 521 g | 450 | Y | Feb 2024 | US$ 1 599 | amazon.com | |
| 8. | Hasselblad X1D II | 148 mm | 97 mm | 70 mm | 766 g | .. | Y | Jun 2019 | US$ 5 749 | ebay.com | |
| 9. | Leica Q2 | 130 mm | 80 mm | 92 mm | 718 g | 370 | Y | Mar 2019 | US$ 4 999 | amazon.com | |
| 10. | Leica Q3 | 130 mm | 80 mm | 93 mm | 743 g | 350 | Y | May 2023 | US$ 5 999 | amazon.com | |
| 11. | Panasonic S5 | 133 mm | 98 mm | 82 mm | 714 g | 440 | Y | Sep 2020 | US$ 1 999 | amazon.com | |
| 12. | Pentax K-3 | 131 mm | 100 mm | 77 mm | 800 g | 560 | Y | Oct 2013 | US$ 1 299 | ebay.com | |
| 13. | Pentax K-3 II | 131 mm | 100 mm | 77 mm | 800 g | 720 | Y | Apr 2015 | US$ 1 099 | ebay.com | |
| 14. | Pentax K-70 | 126 mm | 93 mm | 74 mm | 688 g | 410 | Y | Jun 2016 | US$ 649 | ebay.com | |
| 15. | Pentax KP | 132 mm | 101 mm | 76 mm | 703 g | 390 | Y | Jan 2017 | US$ 1 099 | ebay.com | |
| 16. | Pentax WG-8 | 118 mm | 66 mm | 33 mm | 242 g | 340 | Y | Jun 2024 | US$ 399 | amazon.com | |
| 17. | Sony RX1R III | 113 mm | 68 mm | 88 mm | 498 g | 300 | Y | Jul 2025 | US$ 5 099 | amazon.com | |
| Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders. | |||||||||||
Any camera decision will naturally be influenced heavily by the price. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.
Sensor comparison
The imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units in a sensor of the same technological generation. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the Fujifilm GFX 100RF features a medium format sensor and the Pentax K-3 III an APS-C sensor. The sensor area in the K-3 III is 75 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 0.79 and 1.5. The sensor in the GFX 100RF has a native 4:3 aspect ratio, while the one in the K-3 III offers a 3:2 aspect.

With 101.8MP, the GFX 100RF offers a higher resolution than the K-3 III (25.6MP), but the GFX 100RF nevertheless has the same individual pixel size (pixel pitch of 3.76μm) as the K-3 III due to its larger sensor. It is noteworthy in this context that the GFX 100RF is a mch more recent model (by 3 years and 11 months) than the K-3 III, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.
The resolution advantage of the Fujifilm GFX 100RF implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the GFX 100RF for good quality output (200 dots per inch) amounts to 58.2 x 43.7 inches or 147.9 x 110.9 cm, for very good quality (250 dpi) 46.6 x 34.9 inches or 118.3 x 88.8 cm, and for excellent quality (300 dpi) 38.8 x 29.1 inches or 98.6 x 74 cm. The corresponding values for the Pentax K-3 III are 31 x 20.6 inches or 78.6 x 52.4 cm for good quality, 24.8 x 16.5 inches or 62.9 x 41.9 cm for very good quality, and 20.6 x 13.8 inches or 52.4 x 35 cm for excellent quality prints.
The GFX 100RF has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.
Unlike the GFX 100RF, the K-3 III has the capacity to capture high quality composite images (YESMP) by combining multiple shots after shifting its sensor by miniscule distances. This multi-shot, pixel-shift mode is most suitable for photography of stationary objects (landscapes, studio scenes).
The Fujifilm GFX 100RF has a native sensitivity range from ISO 80 to ISO 12800, which can be extended to ISO 40-102400. The corresponding ISO settings for the Pentax K-3 III are ISO 100 to ISO 160000 (no boost).
In terms of underlying technology, the GFX 100RF is build around a BSI-CMOS sensor, while the K-3 III uses a CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

For many cameras, data on sensor performance has been reported by DXO Mark. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

| Camera Model |
Sensor Class |
Resolution (MP) |
Horiz. Pixels |
Vert. Pixels |
Video Format |
DXO Portrait |
DXO Landscape |
DXO Sports |
DXO Overall |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Fujifilm GFX 100RF | Medium Format | 101.8 | 11648 | 8736 | 4K/30p | 25.9 | 15.1 | 3805 | 101 | |
| 2. | Pentax K-3 III | APS-C | 25.6 | 6192 | 4128 | 4K/30p | 24.2 | 13.7 | 2083 | 85 | |
| 3. | Canon R5 C | Full Frame | 44.8 | 8192 | 5464 | 8k/60p | 25.4 | 14.5 | 3082 | 96 | |
| 4. | Fujifilm GFX 50R | Medium Format | 51.1 | 8256 | 6192 | 1080/30p | 25.7 | 14.4 | 3169 | 98 | |
| 5. | Fujifilm GFX 100S II | Medium Format | 101.8 | 11648 | 8736 | 4K/30p | 25.9 | 15.1 | 3720 | 101 | |
| 6. | Fujifilm X100V | APS-C | 26.0 | 6240 | 4160 | 4K/30p | 24.2 | 13.6 | 1996 | 84 | |
| 7. | Fujifilm X100VI | APS-C | 39.8 | 7728 | 5152 | 6.2K/30p | 24.3 | 14.1 | 2397 | 86 | |
| 8. | Hasselblad X1D II | Medium Format | 51.3 | 8272 | 6200 | 1080/25p | 25.7 | 14.5 | 3234 | 99 | |
| 9. | Leica Q2 | Full Frame | 46.7 | 8368 | 5584 | 4K/30p | 26.4 | 13.5 | 2491 | 96 | |
| 10. | Leica Q3 | Full Frame | 60.3 | 9528 | 6328 | 8K/30p | 25.4 | 14.7 | 3216 | 96 | |
| 11. | Panasonic S5 | Full Frame | 24.0 | 6000 | 4000 | 4K/60p | 25.1 | 14.5 | 2697 | 94 | |
| 12. | Pentax K-3 | APS-C | 24.1 | 6016 | 4000 | 1080/60i | 23.7 | 13.4 | 1216 | 80 | |
| 13. | Pentax K-3 II | APS-C | 24.1 | 6016 | 4000 | 1080/60i | 23.6 | 13.6 | 1106 | 80 | |
| 14. | Pentax K-70 | APS-C | 24.0 | 6000 | 4000 | 1080/60i | 23.8 | 13.1 | 1639 | 80 | |
| 15. | Pentax KP | APS-C | 24.1 | 6016 | 4000 | 1080/60i | 23.9 | 13.2 | 1699 | 81 | |
| 16. | Pentax WG-8 | 1/2.3 | 20.2 | 5184 | 3888 | 4K/30p | 20.9 | 12.8 | 1626 | 54 | |
| 17. | Sony RX1R III | Full Frame | 60.2 | 9504 | 6336 | 4K/30p | 25.4 | 14.9 | 3417 | 97 | |
| Note: DXO values in italics represent estimates based on sensor size and age. | |||||||||||
Many modern cameras are not only capable of taking still images, but can also record movies. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, and both provide the same movie specifications (4K/30p).
Feature comparison
Apart from body and sensor, cameras can and do differ across a variety of features. For example, the GFX 100RF has an electronic viewfinder (5760k dots), while the K-3 III has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The viewfinders of both cameras offer the same field of view (100%), but the viewfinder of the GFX 100RF has a higher magnification than the one of the K-3 III (0.84x vs 0.70x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The table below summarizes some of the other core capabilities of the Fujifilm GFX 100RF and Pentax K-3 III in connection with corresponding information for a sample of similar cameras.

| Camera Model |
Viewfinder (Type or 000 dots) |
Control Panel (yes/no) |
LCD Specifications (inch/000 dots) |
LCD Attach- ment |
Touch Screen (yes/no) |
Max Shutter Speed * |
Max Shutter Flaps * |
Built-in Flash (yes/no) |
Built-in Image Stab |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Fujifilm GFX 100RF | 5760 | n | 3.2 / 2100 | tilting | Y | 1/4000s | 6.0/s | n | n | |
| 2. | Pentax K-3 III | optical | Y | 3.2 / 1620 | fixed | Y | 1/8000s | 12.0/s | n | Y | |
| 3. | Canon R5 C | 5760 | Y | 3.2 / 2100 | swivel | Y | 1/8000s | 12.0/s | n | n | |
| 4. | Fujifilm GFX 50R | 3690 | n | 3.2 / 2360 | tilting | Y | 1/4000s | 3.0/s | n | n | |
| 5. | Fujifilm GFX 100S II | 5760 | Y | 3.2 / 2360 | full-flex | Y | 1/4000s | 7.0/s | n | Y | |
| 6. | Fujifilm X100V | 3690 | n | 3.0 / 1620 | tilting | Y | 1/4000s | 11.0/s | n | n | |
| 7. | Fujifilm X100VI | 3690 | n | 3.0 / 1620 | tilting | Y | 1/4000s | 11.0/s | n | Y | |
| 8. | Hasselblad X1D II | 3690 | n | 3.6 / 2360 | fixed | Y | 1/2000s | 2.7/s | n | n | |
| 9. | Leica Q2 | 3680 | n | 3.0 / 1040 | fixed | Y | 1/2000s | 10.0/s | n | Y | |
| 10. | Leica Q3 | 5760 | n | 3.0 / 1840 | tilting | Y | 1/2000s | 15.0/s | n | Y | |
| 11. | Panasonic S5 | 2360 | n | 3.0 / 1840 | swivel | Y | 1/8000s | 7.0/s | n | Y | |
| 12. | Pentax K-3 | optical | Y | 3.2 / 1037 | fixed | n | 1/8000s | 8.3/s | Y | Y | |
| 13. | Pentax K-3 II | optical | Y | 3.2 / 1037 | fixed | n | 1/8000s | 8.3/s | n | Y | |
| 14. | Pentax K-70 | optical | n | 3.0 / 921 | swivel | n | 1/6000s | 6.0/s | Y | Y | |
| 15. | Pentax KP | optical | n | 3.0 / 921 | tilting | n | 1/6000s | 7.0/s | Y | Y | |
| 16. | Pentax WG-8 | none | n | 3.0 / 1040 | fixed | n | 1/4000s | 8.0/s | Y | n | |
| 17. | Sony RX1R III | 2360 | n | 3.0 / 2360 | fixed | Y | 1/4000s | 5.0/s | n | n | |
| Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one. | |||||||||||
One feature that is present on the K-3 III, but is missing on the GFX 100RF is a top-level LCD. While being, of course, smaller than the rear screen, the control panel conveys some of the essential shooting information and can be convenient for quick and easy settings verification.
The reported shutter speed information refers to the use of the mechanical shutter. Yet, some cameras only have an electronic shutter, while others have an electronic shutter in addition to a mechanical one. In fact, the GFX 100RF is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).
The Fujifilm GFX 100RF and the Pentax K-3 III both have an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.
Concerning the storage of imaging data, both the GFX 100RF and the K-3 III write their files to SDXC cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails. However, while the GFX 100RF supports UHS-II cards (Ultra High Speed data transfer of up to 312 MB/s) on both slots, the K-3 III supports UHS-II only on its first slot and UHS-I (data transfer speed up to 104 MB/s) on the second one.
Connectivity comparison
For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Fujifilm GFX 100RF and Pentax K-3 III and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

| Camera Model |
Hotshoe Port |
Internal Mic / Speaker |
Microphone Port |
Headphone Port |
HDMI Port |
USB Port |
WiFi Support |
NFC Support |
Bluetooth Support |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Fujifilm GFX 100RF | Y | stereo / mono | Y | Y | micro | 3.2 | Y | - | Y | |
| 2. | Pentax K-3 III | Y | stereo / mono | Y | Y | micro | 3.2 | Y | - | Y | |
| 3. | Canon R5 C | Y | stereo / mono | Y | Y | micro | 3.2 | Y | - | Y | |
| 4. | Fujifilm GFX 50R | Y | stereo / mono | Y | Y | micro | 3.0 | Y | - | Y | |
| 5. | Fujifilm GFX 100S II | Y | stereo / mono | Y | Y | micro | 3.2 | Y | - | Y | |
| 6. | Fujifilm X100V | Y | stereo / mono | Y | - | micro | 3.1 | Y | - | Y | |
| 7. | Fujifilm X100VI | Y | stereo / mono | Y | - | micro | 3.2 | Y | - | Y | |
| 8. | Hasselblad X1D II | Y | stereo / mono | Y | Y | - | 3.0 | Y | - | - | |
| 9. | Leica Q2 | Y | stereo / mono | - | - | - | - | Y | - | Y | |
| 10. | Leica Q3 | Y | stereo / mono | - | - | micro | 3.1 | Y | - | Y | |
| 11. | Panasonic S5 | Y | stereo / mono | Y | Y | micro | 3.2 | Y | - | Y | |
| 12. | Pentax K-3 | Y | mono / mono | Y | Y | mini | 3.0 | - | - | - | |
| 13. | Pentax K-3 II | Y | mono / mono | Y | Y | mini | 3.0 | - | - | - | |
| 14. | Pentax K-70 | Y | stereo / mono | Y | - | mini | 2.0 | Y | - | - | |
| 15. | Pentax KP | Y | stereo / mono | Y | - | - | 2.0 | Y | - | - | |
| 16. | Pentax WG-8 | - | mono / mono | - | - | - | 3.0 | - | - | - | |
| 17. | Sony RX1R III | Y | stereo / mono | Y | Y | micro | 3.2 | Y | - | Y |
Studio photographers will appreciate that the Pentax K-3 III (unlike the GFX 100RF) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
Travel and landscape photographers will find it useful that the K-3 III has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.
Both the GFX 100RF and the K-3 III are recent models that are part of the current product line-up. The K-3 III replaced the earlier Pentax K-3 II, while the GFX 100RF does not have a direct predecessor. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Fujifilm and Pentax websites.
Review summary
So what is the bottom line? Is there a clear favorite between the Fujifilm GFX 100RF and the Pentax K-3 III? Which camera is better? The listing below highlights the relative strengths of the two models.

Reasons to prefer the Fujifilm GFX 100RF:
- More detail: Offers more megapixels (101.8 vs 25.6MP) with a 96% higher linear resolution.
- Better image quality: Features a larger and more technologically advanced imaging sensor.
- Richer colors: The sensor size advantage translates into images with better, more accurate colors.
- More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
- Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- More framing info: Has an electronic viewfinder that displays shooting data.
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.84x vs 0.70x).
- More detailed LCD: Has a higher resolution rear screen (2100k vs 1620k dots).
- More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
- Less disturbing: Has an electronic shutter option for completely silent shooting.
- Ready to shoot: Comes with a built-in lens, while the K-3 III requires a separate lens.
- More compact: Is smaller (134x90mm vs 135x104mm) and thus needs less room in the bag.
- Less heavy: Is lighter even though it comes with a built-in lens (unlike the K-3 III).
- Easier travel charging: Can be conveniently charged via its USB port.
- More modern: Reflects 3 years and 11 months of technical progress since the K-3 III launch.

Advantages of the Pentax K-3 III:
- High quality composites: Can combine several shots after pixel-shifting its sensor.
- Brighter framing: Features an optical viewfinder for clear, lag-free composition.
- Easier setting verification: Features a control panel on top to check shooting parameters.
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- Faster burst: Shoots at higher frequency (12 vs 6 flaps/sec) to capture the decisive moment.
- More flexible: Makes it possible to change lenses and thus to use specialty optics.
- Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
- Easier geotagging: Features an internal GPS sensor to log localization data.
- Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
- More heavily discounted: Has been around for much longer (launched in March 2021).
If the number of relative strengths (bullet points above) is taken as a guide, the GFX 100RF is the clear winner of the match-up (16 : 10 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding on a new camera. A professional wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.
How about other alternatives? Do the specifications of the Fujifilm GFX 100RF and the Pentax K-3 III place the cameras among the top in their class? Find out in the latest Best Prime Lens Compact Camera and Best DSLR Camera listings whether the two cameras rank among the cream of the crop.
In any case, while the comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it says little about, for example, the shooting experience and imaging performance of the GFX 100RF and the K-3 III in practical situations. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.
Expert reviews
This is why hands-on reviews by experts are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

| Camera Model |
AP score |
CL score |
DCW score |
DPR score |
EPZ score |
PB score |
Camera Launch |
Launch Price |
Street Price |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Fujifilm GFX 100RF | .. | .. | .. | .. | .. | .. | Mar 2025 | US$ 4 899 | amazon.com | |
| 2. | Pentax K-3 III | 4/5 | .. | 3/5 | .. | 4.5/5 | .. | Mar 2021 | US$ 1 999 | amazon.com | |
| 3. | Canon R5 C | .. | + + | .. | .. | .. | .. | Jan 2022 | US$ 4 499 | amazon.com | |
| 4. | Fujifilm GFX 50R | 5/5 | .. | 5/5 | 84/100 | 4.5/5 | 4.5/5 | Sep 2018 | US$ 4 499 | ebay.com | |
| 5. | Fujifilm GFX 100S II | .. | .. | .. | .. | .. | .. | May 2024 | US$ 4 999 | amazon.com | |
| 6. | Fujifilm X100V | 5/5 | + + | 4.5/5 | 86/100 | 5/5 | 4.5/5 | Feb 2020 | US$ 1 399 | ebay.com | |
| 7. | Fujifilm X100VI | 5/5 | + + | 4.5/5 | 87/100 | .. | 4.5/5 | Feb 2024 | US$ 1 599 | amazon.com | |
| 8. | Hasselblad X1D II | .. | .. | 4/5 | .. | 4/5 | 4/5 | Jun 2019 | US$ 5 749 | ebay.com | |
| 9. | Leica Q2 | .. | .. | 4.5/5 | 84/100 | 4.5/5 | 4/5 | Mar 2019 | US$ 4 999 | amazon.com | |
| 10. | Leica Q3 | 5/5 | .. | 4.5/5 | .. | .. | 4.5/5 | May 2023 | US$ 5 999 | amazon.com | |
| 11. | Panasonic S5 | 4.5/5 | + + | 4.5/5 | 88/100 | 4.5/5 | 4.5/5 | Sep 2020 | US$ 1 999 | amazon.com | |
| 12. | Pentax K-3 | 4/5 | .. | .. | 83/100 | 5/5 | 5/5 | Oct 2013 | US$ 1 299 | ebay.com | |
| 13. | Pentax K-3 II | 4.5/5 | .. | .. | .. | 5/5 | 5/5 | Apr 2015 | US$ 1 099 | ebay.com | |
| 14. | Pentax K-70 | 4.5/5 | .. | 4/5 | 79/100 | 4.5/5 | 4.5/5 | Jun 2016 | US$ 649 | ebay.com | |
| 15. | Pentax KP | 4/5 | .. | 3/5 | 82/100 | 5/5 | 4.5/5 | Jan 2017 | US$ 1 099 | ebay.com | |
| 16. | Pentax WG-8 | .. | .. | .. | .. | .. | .. | Jun 2024 | US$ 399 | amazon.com | |
| 17. | Sony RX1R III | .. | .. | .. | .. | .. | .. | Jul 2025 | US$ 5 099 | amazon.com | |
| Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available. | |||||||||||
The above review scores should be interpreted with care, though. The assessments were made in relation to similar cameras of the same technological generation. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Check GFX 100RF price at
amazon.com

Check K-3 III price at
amazon.com
Other camera comparisons
Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just use the search menu below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.
- Canon R3 vs Pentax K-3 III
- Canon R6 Mark II vs Fujifilm GFX 100RF
- Fujifilm GFX 100 II vs Fujifilm GFX 100RF
- Fujifilm GFX 100RF vs Nikon Z50 II
- Fujifilm GFX 100RF vs OM System OM-5
- Fujifilm GFX 100RF vs Panasonic L1
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Specifications: Fujifilm GFX 100RF vs Pentax K-3 III
Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.
| Camera Model | Fujifilm GFX 100RF | Pentax K-3 III |
|---|---|---|
| Camera Type | Fixed lens compact camera | Digital single lens reflex |
| Camera Lens | 28mm f/4.0 | Pentax K mount lenses |
| Launch Date | March 2025 | March 2021 |
| Launch Price | USD 4,899 | USD 1,999 |
| Sensor Specs | Fujifilm GFX 100RF | Pentax K-3 III |
| Sensor Technology | BSI-CMOS | CMOS |
| Sensor Format | Medium Format Sensor | APS-C Sensor |
| Sensor Size | 43.8 x 32.9 mm | 23.3 x 15.5 mm |
| Sensor Area | 1441.02 mm2 | 361.15 mm2 |
| Sensor Diagonal | 54.8 mm | 28 mm |
| Crop Factor | 0.79x | 1.5x |
| Sensor Resolution | 101.8 Megapixels | 25.6 Megapixels |
| Image Resolution | 11648 x 8736 pixels | 6192 x 4128 pixels |
| Pixel Pitch | 3.76 μm | 3.76 μm |
| Pixel Density | 7.06 MP/cm2 | 7.08 MP/cm2 |
| Moiré control | no AA filter | no AA filter |
| Movie Capability | 4K/30p Video | 4K/30p Video |
| ISO Setting | 80 - 12,800 ISO | 100 - 160,000 ISO |
| ISO Boost | 40 - 102,400 ISO | no Enhancement |
| Image Processor | X-Processor 5 | PRIME V |
| Screen Specs | Fujifilm GFX 100RF | Pentax K-3 III |
| Viewfinder Type | Electronic viewfinder | Optical viewfinder |
| Viewfinder Field of View | 100% | 100% |
| Viewfinder Magnification | 0.84x | 0.70x |
| Viewfinder Resolution | 5760k dots | |
| Top-Level Screen | no Top Display | Control Panel |
| LCD Framing | Live View | Live View |
| Rear LCD Size | 3.2inch | 3.2inch |
| LCD Resolution | 2100k dots | 1620k dots |
| LCD Attachment | Tilting screen | Fixed screen |
| Touch Input | Touchscreen | Touchscreen |
| Shooting Specs | Fujifilm GFX 100RF | Pentax K-3 III |
| Focus System | On-Sensor Phase-detect | Phase-detect AF |
| Manual Focusing Aid | Focus Peaking | Focus Peaking |
| Max Shutter Speed (mechanical) | 1/4000s | 1/8000s |
| Continuous Shooting | 6 shutter flaps/s | 12 shutter flaps/s |
| Electronic Shutter | up to 1/16000s | no E-Shutter |
| Time-Lapse Photography | Intervalometer built-in | Intervalometer built-in |
| Image Stabilization | no shake reduction | In-body stabilization |
| Fill Flash | no On-Board Flash | no On-Board Flash |
| Storage Medium | SDXC cards | SDXC cards |
| Single or Dual Card Slots | Dual card slots | Dual card slots |
| UHS card support | Dual UHS-II | Single UHS-II |
| Connectivity Specs | Fujifilm GFX 100RF | Pentax K-3 III |
| External Flash | Hotshoe | Hotshoe |
| Studio Flash | no PC Sync | PC Sync socket |
| USB Connector | USB 3.2 | USB 3.2 |
| HDMI Port | micro HDMI | micro HDMI |
| Microphone Port | External MIC port | External MIC port |
| Headphone Socket | Headphone port | Headphone port |
| Wifi Support | Wifi built-in | Wifi built-in |
| Bluetooth Support | Bluetooth built-in | Bluetooth built-in |
| Geotagging | no internal GPS | GPS built-in |
| Body Specs | Fujifilm GFX 100RF | Pentax K-3 III |
| Environmental Sealing | Weathersealed body | Weathersealed body |
| Battery Type | Fujifilm NP-W235 | Pentax D-LI90 |
| Battery Life (CIPA) | 820 shots per charge | 800 shots per charge |
| In-Camera Charging | USB charging | no USB charging |
| Body Dimensions |
134 x 90 x 77 mm (5.3 x 3.5 x 3.0 in) |
135 x 104 x 74 mm (5.3 x 4.1 x 2.9 in) |
| Camera Weight | 735 g (25.9 oz) | 820 g (28.9 oz) |

Check GFX 100RF price at
amazon.com

Check K-3 III price at
amazon.com
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