This is one in a series of posts on the Fujifilm GFX 100S. You should be able to find all the posts about that camera in the Category List on the right sidebar, below the Articles widget. There’s a drop-down menu there that you can use to get to all the posts in this series; just look for “GFX 100S”.
I ran Roger Cicala’s Q&D field curvature test (Photoshop>Filter>Find Edges) on the Fujifilm 80 mm f/1.7 wide open on the GFX 100S.
The lens front-focuses a bit towards the edge of the frame.