I wanted to try a full frame lens with GFX and see how it fares. I used the Tamron 70-200mm F/2.8 Di VC USD G2 lens using the Steelsring EF/GFX adapter, and it was quite good. Not as good a native G mount lens but not bad at all.
Gear used: Fuji GFX 50S + Steelsring EF/GFX + Tamron 70-200mm F/2.8 Di VC USD G2
Exif: 200mm ▪ F/2.8 ▪ 1/200 ▪ ISO 1000