Thanks to CameraSize.com it’s possible to do an accurate Fujifilm GFX100S comparison using the camera mount to size the camera. The dimensions of the photos out there might be slightly different from the final production camera, but the GFX mount and sensor size will never change. I decided to include a few different popular cameras here in addition to some monstrously large cameras. I could also make a printable like I did the GFX if there is demand for it, but the Fujifilm GFX100S is going to be a more niche product than the Fujifilm GFX50S and GFX50R.
Above and a little bit larger below I included the Sony a7RIII, Fujifilm X-H1, Nikon Z7, Canon EOS R, Fujifilm GFX50R, Fujifilm GFX50S, Fujifilm GFX100S, Canon EOS-1D x Mark II, and Nikon D5. Probably the best way to view this comparison is by downloading the images, which you can grab by right-clicking here and here to save the images.
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Pre-Order GFX50R: B&H Photo / Amazon / Adorama
Fujifilm GFX 50S: B&H Photo / Amazon / Adorama
Fujifilm X-H1 Camera: B&H Photo / Amazon / Adorama
Nikon Z7: B&H Photo / Amazon / Adorama
Nikon Z6: B&H Photo / Amazon / Adorama
Canon EOS R: B&H Photo / Amazon / Adorama