Fujifilm GFX100S: How Much Does Diffraction Affect Image Quality from f/5.6 to f/32?
This page shows diffraction dulling effects from f/5.6 through f/32 on the Fujifilm GFX100S/GFX100, which have ~3.76 micron pixels, same size as the Sony A7R IV and the PhaseOne IQ4 150.
Recommendations are given for handling the competing goals of increasing depth of field vs diffraction dulling.
Fujifilm GFX100/GFX100S: Diffraction Effects from f/5.6 through f/32
Includes various mouse-over crop series from f/5.6 through f/32, which allow intuitive understanding of what happens. Plus discussion.

Fujifilm GFX100S + Fujifilm GF 35-70mm f/4.5-5.6 WR @ 54.6mm equiv (66.4mm)
[low-res image for bot]