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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.

Headline Specifications
Fujifilm GFX 100RF
versus
Pentax K-3 III
Fujifilm GFX 100RF   Pentax K-3 III
Fixed lens compact camera Digital single lens reflex
28mm f/4.0 Pentax K mount lenses
101.8 MP – Medium Format sensor 25.6 MP – APS-C sensor
4K/30p Video 4K/30p Video
ISO 80-12,800 (40 - 102,400) ISO 100-160,000
Electronic viewfinder (5760k dots) Optical viewfinder
3.2" LCD – 2100k dots 3.2" LCD – 1620k dots
Tilting touchscreen Fixed touchscreen
6 shutter flaps per second 12 shutter flaps per second
no shake reductionIn-body stabilization
Weathersealed bodyWeathersealed body
820 shots per battery charge800 shots per battery charge
134 x 90 x 77 mm, 735 g 135 x 104 x 74 mm, 820 g
logo
Check GFX 100RF price at
amazon.com
logo
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.

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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).

Size Fujifilm GFX 100RF vs Pentax K-3 III
Compare GFX 100RF versus K-3 III top
Comparison GFX 100RF or K-3 III rear

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.

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Body Specifications
  empty 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 499ebay.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 399ebay.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 749ebay.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 299ebay.com
13.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 US$ 1 099ebay.com
14.
 
Pentax K-70 126 mm 93 mm 74 mm 688 g 410 Y Jun 2016 US$ 649ebay.com
15.
 
Pentax KP 132 mm 101 mm 76 mm 703 g 390 Y Jan 2017 US$ 1 099ebay.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.

Fujifilm GFX 100RF and Pentax K-3 III sensor measures

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.

GFX 100RF versus K-3 III MP

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.

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Sensor Characteristics
  empty 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 87364K/30p25.915.13805101
2.
 
Pentax K-3 III APS-C 25.6 6192 41284K/30p24.213.7208385
3.
 
Canon R5 C Full Frame 44.8 8192 54648k/60p25.414.5308296
4.
 
Fujifilm GFX 50R Medium Format 51.1 8256 61921080/30p25.714.4316998
5.
 
Fujifilm GFX 100S II Medium Format 101.8 11648 87364K/30p25.915.13720101
6.
 
Fujifilm X100V APS-C 26.0 6240 41604K/30p24.213.6199684
7.
 
Fujifilm X100VI APS-C 39.8 7728 51526.2K/30p24.314.1239786
8.
 
Hasselblad X1D II Medium Format 51.3 8272 62001080/25p25.714.5323499
9.
 
Leica Q2 Full Frame 46.7 8368 55844K/30p26.413.5249196
10.
 
Leica Q3 Full Frame 60.3 9528 63288K/30p25.414.7321696
11.
 
Panasonic S5 Full Frame 24.0 6000 40004K/60p25.114.5269794
12.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
13.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
14.
 
Pentax K-70 APS-C 24.0 6000 40001080/60i23.813.1163980
15.
 
Pentax KP APS-C 24.1 6016 40001080/60i23.913.2169981
16.
 
Pentax WG-8 1/2.3 20.2 5184 38884K/30p20.912.8162654
17.
 
Sony RX1R III Full Frame 60.2 9504 63364K/30p25.414.9341797
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.

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Core Features
  empty 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 100RF5760 n3.2 / 2100 tilting Y 1/4000s 6.0/s n n
2.
 
Pentax K-3 IIIoptical Y3.2 / 1620 fixed Y 1/8000s 12.0/s n Y
3.
 
Canon R5 C5760 Y3.2 / 2100 swivel Y 1/8000s 12.0/s n n
4.
 
Fujifilm GFX 50R3690 n3.2 / 2360 tilting Y 1/4000s 3.0/s n n
5.
 
Fujifilm GFX 100S II5760 Y3.2 / 2360 full-flex Y 1/4000s 7.0/s n Y
6.
 
Fujifilm X100V3690 n3.0 / 1620 tilting Y 1/4000s 11.0/s n n
7.
 
Fujifilm X100VI3690 n3.0 / 1620 tilting Y 1/4000s 11.0/s n Y
8.
 
Hasselblad X1D II3690 n3.6 / 2360 fixed Y 1/2000s 2.7/s n n
9.
 
Leica Q23680 n3.0 / 1040 fixed Y 1/2000s 10.0/s n Y
10.
 
Leica Q35760 n3.0 / 1840 tilting Y 1/2000s 15.0/s n Y
11.
 
Panasonic S52360 n3.0 / 1840 swivel Y 1/8000s 7.0/s n Y
12.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3/s Y Y
13.
 
Pentax K-3 IIoptical Y3.2 / 1037 fixed n 1/8000s 8.3/s n Y
14.
 
Pentax K-70optical n3.0 / 921 swivel n 1/6000s 6.0/s Y Y
15.
 
Pentax KPoptical n3.0 / 921 tilting n 1/6000s 7.0/s Y Y
16.
 
Pentax WG-8none n3.0 / 1040 fixed n 1/4000s 8.0/s Y n
17.
 
Sony RX1R III2360 n3.0 / 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.

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Input-Output Connections
  empty Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Fujifilm GFX 100RFYstereo / monoYYmicro3.2Y-Y
2.
 
Pentax K-3 IIIYstereo / monoYYmicro3.2Y-Y
3.
 
Canon R5 CYstereo / monoYYmicro3.2Y-Y
4.
 
Fujifilm GFX 50RYstereo / monoYYmicro3.0Y-Y
5.
 
Fujifilm GFX 100S IIYstereo / monoYYmicro3.2Y-Y
6.
 
Fujifilm X100VYstereo / monoY-micro3.1Y-Y
7.
 
Fujifilm X100VIYstereo / monoY-micro3.2Y-Y
8.
 
Hasselblad X1D IIYstereo / monoYY-3.0Y--
9.
 
Leica Q2Ystereo / mono----Y-Y
10.
 
Leica Q3Ystereo / mono--micro3.1Y-Y
11.
 
Panasonic S5Ystereo / monoYYmicro3.2Y-Y
12.
 
Pentax K-3Ymono / monoYYmini3.0---
13.
 
Pentax K-3 IIYmono / monoYYmini3.0---
14.
 
Pentax K-70Ystereo / monoY-mini2.0Y--
15.
 
Pentax KPYstereo / monoY--2.0Y--
16.
 
Pentax WG-8-mono / mono---3.0---
17.
 
Sony RX1R IIIYstereo / monoYYmicro3.2Y-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.

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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.

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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.

GFX 100RF 16:10 K-3 III

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.

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Expert Camera Reviews
  empty  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 III4/5..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 50R5/5..5/584/1004.5/54.5/5 Sep 2018 US$ 4 499ebay.com
5.
 
Fujifilm GFX 100S II............ May 2024 US$ 4 999 amazon.com
6.
 
Fujifilm X100V5/5+ +4.5/586/1005/54.5/5 Feb 2020 US$ 1 399ebay.com
7.
 
Fujifilm X100VI5/5+ +4.5/587/100..4.5/5 Feb 2024 US$ 1 599 amazon.com
8.
 
Hasselblad X1D II....4/5..4/54/5 Jun 2019 US$ 5 749ebay.com
9.
 
Leica Q2....4.5/584/1004.5/54/5 Mar 2019 US$ 4 999 amazon.com
10.
 
Leica Q35/5..4.5/5....4.5/5 May 2023 US$ 5 999 amazon.com
11.
 
Panasonic S54.5/5+ +4.5/588/1004.5/54.5/5 Sep 2020 US$ 1 999 amazon.com
12.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 US$ 1 299ebay.com
13.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 US$ 1 099ebay.com
14.
 
Pentax K-704.5/5..4/579/1004.5/54.5/5 Jun 2016 US$ 649ebay.com
15.
 
Pentax KP4/5..3/582/1005/54.5/5 Jan 2017 US$ 1 099ebay.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.

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Check GFX 100RF price at
amazon.com
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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.

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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 Specifications
    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 AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/8000s
    Continuous Shooting 6 shutter flaps/s 12 shutter flaps/s
    Electronic Shutterup to 1/16000sno E-Shutter
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    Image Stabilizationno shake reductionIn-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 SealingWeathersealed bodyWeathersealed body
    Battery Type Fujifilm NP-W235 Pentax D-LI90
    Battery Life (CIPA)820 shots per charge800 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)
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