A few observations. I do not think the Nikon lenses will cover the GFX sensor. You will have vignetting. Also, not being familiar with the adapters available, you will most probably lose some of the lenses capabilities, like autofocus and automatic aperture control. Lastly, the size of the MF sensor (not truly MF, but larger than FX) can give a much nicer image than the same number of pixels on an FX sensor. If you do go for the GFX, spring for the Fuji lenses. They are excellent. Otherwise, you might not get the quality the camera is capable of delivering. Older MF lenses don't necessarily have the resolving power needed for digital, plus who knows what image deterioration an adapter might introduce.