Fujifilm GFX 50s + 63mm f/2.8 Aperture Series: Yellow House at Dusk
See my Fujifilm GFX wish list.
This is an in-depth evaluation of the 63/2.8 with findings I consider highly relevant to the GFX system. I consider this distance scene as one comparable in makeup as to what one might do for a landscape shot (wide range of near to far detail). It has a lot of very fine detail at distance for checking out performance.
In my review of the Fujifilm GFX system in Medium Format I evaluate the about $1699 Fujifilm GF 63mm f/2.8:
Fujifilm GFX 50s + 63mm f/2.8 Aperture Series: Yellow House at Dusk
Includes images from f/4 to f/16 at up to full resolution along with large crops.

GFX 50S + Fujifilm GF 63mm f/2.8 R WR @ 51.8mm equiv (63mm)
[low-res image for bot]