Fujifilm GFX 50S II vs Sony a9

This is a full comparison between the cameras Fujifilm GFX 50S II and Sony a9. We compare them by looking at the categories you see below.

Manufacturing

Fujifilm GFX 50S II is manufacturered by Fujifilm but Sony a9 is from Sony. Both Fujifilm and Sony are well known brands though.

Fujifilm GFX 50S II were released 2021 and Sony a9 was released 2017. That is a 4 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera Released
Fujifilm GFX 50S II 2021
Sony a9 2017

Type of camera

Both these cameras are Mirrorless cameras. No difference there.

Sensors / crop factor

These cameras have different sensors. Fujifilm GFX 50S II has a "Fujifilm Medium Format"-sensor while Sony a9 has a "Sony Full Frame"-sensor, and their difference in sensors will also affect the crop factor and experience focal length. See the table below.

Camera Focal length, 50mm f/1.8 **
Fujifilm GFX 50S II 39.5 mm
Fujifilm Medium Format sensor
Crop factor/focal length multiplier by * 0.79
Sony a9 50 mm
Full-frame sensor
No crop factor/focal length multiplier

** Experienced focal length when using a lens such as a common "50mm f/1.8"

Learn more about crop factor and focal length multiplier here:

Resolution

Fujifilm GFX 50S II has a 51 MP (Megapixels) resolution while Sony a9 has 24 MP. If we break down this in more detail this is the data behind the numbers:

Camera Megapixels
Fujifilm GFX 50S II 51 MP
51121152 pixels
8256 x 6192
Sony a9 24 MP
24000000 pixels
6000 x 4000

Fujifilm GFX 50S II has a 113 % larger resolution than Sony a9. This could give you more details in the picture but also a possibility to crop more in the pictures, afterward while editing the pictures, if needed that is.

ISO range

Sony a9 has a larger ISO-range than Fujifilm GFX 50S II. Sony a9 has an ISO range that stretches from 100 to 51200 while Fujifilm GFX 50S II has 100 to 12800.

Camera ISO Range
Fujifilm GFX 50S II 100-12800
Sony a9 100-51200

Autofocus and lens compatibility

Both of these cameras have a built-in autofocus motor. Some lenses, that support autofocus, do not have an autofocus motor of their own but this won't cause any problems with these two cameras.

Here is a complete overview of which lenses work with each camera:
Lens compatibility chart for Fujifilm GFX 50S II
Lens compatibility chart for Sony a9

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Fujifilm GFX 50S II can shoot up to 3 pictures per seconds and Sony a9 can shoot up to 20 pictures per seconds.

Camera FPS (Frames per second)
Fujifilm GFX 50S II 3
Sony a9 20

Ability to record movies

It is becoming more and more popular to record movies with digital cameras.

In this case, both Fujifilm GFX 50S II and Sony a9 can shoot movies.

Weight

The weight of the camera can be an extremely important factor, especially if the camera is about to be used, or carried around, for several hours at a time.

Fujifilm GFX 50S II weighs 900 gr (equal to 1.98 lb) which is 34% heavier than Sony a9 and its 673 gr (or 1.48 lb).

Camera Weight
Fujifilm GFX 50S II 900 gr
1.98 lb
Sony a9 673 gr
1.48 lb

Fujifilm GFX 50S II vs Sony a9 Specs

Below you will find the complete and detailed technical specs for both Fujifilm GFX 50S II and Sony a9, next to each other. Each category of data is a link to an article covering the subject, giving you a deeper understanding so you can better understand the strengths and weaknesses of the two camera models.

Product
Fujifilm GFX 50S II
Sony a9
Name Fujifilm GFX 50S II Sony a9
Manufacturer Fujifilm Sony
Release Date and Price
Fujifilm GFX 50S II
Sony a9
Release Year 2021 2017
Release Date 2021-09-02 2017-04-19
MSRP 3999 USD 4499 USD
Buy it today
Camera Type
Fujifilm GFX 50S II
Sony a9
Camera Type Mirrorless Mirrorless
Sensor
Fujifilm GFX 50S II
Sony a9
Sensor Size Medium Format (approx 44 x 33 mm) Full Frame (approx 36 x 24 mm)
Sensor Type CMOS Stacked CMOS
Resolution 8256 x 6192 pixels 6000 x 4000 pixels
Megapixels 51 MP 24 MP
Image Processor X-Processor 4 Bionz X
Image
Fujifilm GFX 50S II
Sony a9
ISO Range 100 - 12800 100 - 51200
White Balance Presets 7 10
Custom White Balance Yes Yes
Image Stabilization Yes
(Sensor-Shift)
Yes
(Sensor-Shift (5-axis))
Image Stabilization CIPA Rating 6.5 stops 0 stops
Uncompressed format RAW + TIFF RAW
Optics & Focus
Fujifilm GFX 50S II
Sony a9
Autofocus Motor Yes Yes
Autofocus Contract Detect (sensor)
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Touch
Face Detection
LiveView
Contract Detect (sensor)
Phase Detect
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Touch
Face Detection
LiveView
Focus Points 425 693
Lens Mount Fujifilm G

See Compatible Lenses
Sony E

See Compatible Lenses
Focal Length Multiplier Medium Format
0.79x multiplier
Example:
24 mm becomes 19 mm
50 mm becomes 40 mm
100 mm becomes 79 mm
200 mm becomes 158 mm
Full frame
No multiplier
Example:
24 mm remains 24 mm
50 mm remains 50 mm
100 mm remains 100 mm
200 mm remains 200 mm
Screen & Viewfinder
Fujifilm GFX 50S II
Sony a9
Articulated LCD Tilting Tilting
Screen size 3” 3”
Screen dots 2360000 1440000
Touch screen Yes Yes
Screen type TFT LCD TFT LCD
Live view Yes Yes
Viewfinder Type Electronic Electronic
Viewfinder Coverage 100% 100%
Viewfinder Magnification 0.61× (0.77× 35mm equiv.) 0.78x
Viewfinder Resolution 3690000 3686400
Photography features
Fujifilm GFX 50S II
Sony a9
Frames per second 3 fps 20 fps
Minimum Shutter Speed 3600 seconds 30 seconds
Maximum Shutter Speed 1/4000 seconds 1/8000 seconds
Built-in Flash No No
Built-in Flash Range N/A N/A
External Flash Yes Yes
Self-Timer Yes Yes
Time-lapse Yes No
Metering modes Multi
Center Weighted
Spot
Average
Multi
Center Weighted
Highlight Weighted
Spot
Average
Exposure Compensation +/- 5 (at 1/3 EV steps) +/- 5 (at 1/3 EV, 1/2 EV steps)
Videography features
Fujifilm GFX 50S II
Sony a9
Video recording Yes Yes
Video format MPEG4
H.264
MPEG4
H.264
AVCHD
Video resolution 1920 x 1080
1280 x 720
1920 x 1080
3840 x 2160
Built-in Microphone Yes Yes
Built-in Speakers Yes Yes
Storage
Fujifilm GFX 50S II
Sony a9
Memory Card SD/SDHC
SD/SDHC
Connectivity
Fujifilm GFX 50S II
Sony a9
HDMI Output Yes Yes
Microphone Port Yes Yes
Headphone Port Yes Yes
Wireless Yes
Built-in (802.11ac + Bluetooth)
Yes
Built-in (802.11/b/g/n with NFC)
Remote Control Supported (no further information) Yes (Wired or wireless)
GPS No No
Body & Dimensions
Fujifilm GFX 50S II
Sony a9
Enviromentally sealed Yes Yes
Battery Battery Pack Battery Pack
Battery Details NP-W235 lithium-ion battery & charger
NP-FZ100
Battery Life (CIPA) 440 shots 650 shots
Width 150 mm 127 mm
Height 104 mm 96 mm
Depth 87 mm 63 mm
Weight 900 gram 673 gram