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More testing of lenses today.  Nikon 70-200 f/2.8 IF ED VR (same applies to VR II) - dreadful. Heavy vignette at all focal lengths and apertures. Obvioulsy fine in 35mm mode.  Nikon 70-200 f/4 - some vignetting at full frame (similar to 24mm f/1.8 and Sigma 105 f/2.8 so probably correctable or slight crop to 80-90MP). Perfect in 35mm mode.  Zeiss C/Y 80-200 f/4 (manual focus/aperture) - slight vignette but better than both the above.  Zeiss 28-85 f/3.3 (c/y manual focus/aperture) - not as bad as the Nikon 70-200 f/2.8 but still dreadful.  Sigma 24mm f/2.8 superwide - heavy vignette as above.  

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I use a TECHART ring to mount Canon EF lenses on the GFX 50S-II and 100S-II, maintaining image stabilization and autofocus. The only limitation are lenses with a small rear element diameter that make it impossible to cover medium format. Fast lenses like the EF 85/1.2L or the 100-400L, however, work great.

I also use a Nikon to GFX Fringer and it works very well.  24mm f/1.8 vignettes so best used on 35mm mode.  50mm f/1.8 covers the entire frame very well with no issues and is a superb little lens. 105mm Sigma vignettes slightly but is perfectly usable. 300 f/4 likewise the 105.  I have a 70-200 f/20+.8 incoming to test so will report back but I'm expecting a little vignetting.  Even in 35mm mode the image is still 60MP and if you're prepared to manually crop and correct you can get 80-90 MP images.  I also have a C/Y to GFX adapter.  The 24mm Sigma Superwide vignettes strongly. Ditto 28-80 Zeiss Sonnar. 80-200 f/4 Sonnar is perfectly usable. All work fine as 35mm mode lenses.  I also have an M42 adapter which I tried with the Carl Zeiss Jena 135mm f/3.5 with good results.