For whatever its worth I've done three large archticture shoots with the gfx100 and the following lenses: 23mm fuji, canon 24mm TSE (ii), 50mm TSE (ii) and the 32-64.
The zoom is silly sharp, and unless I'm not pointing the lens up or down too much, works great and slight perspective adjustments are done in post. I've been shooting tethered to capture one. also using a wirelss solution directly to ipad which I can't talk about yet.
Kipon adapter for the Canon glass.
Extremely happy with the results, workflow, everything.
I love everything about that sexy camera.