See my Fujifilm medium format wishlist.
My initial impressions of the Fujifilm GFX-50R are highly favorable in some respects, and much less so in others (ergonomics/haptics are exceptionally poor). The Fujifilm GF 23mm f/4 R WR makes a very nice match to the GFX-50R and eminently portable like a DSLR in size weight.
I have the impression (including hot pixels) that dynamic range is less good than the Fujifilm GFX-50S, but that might be erroneous—gotta shoot more to ascertain. That said, it was my goof to slightly blow the cloud detail in this shot.
The Fujifilm GF 250mm f/4 R LM OIS R WR is a razor sharp lens. I have not yet delved into its focus stability across frames (the linear focusing motor on the Fujifilm GF 120mm f/4 LM OIS WR gave me fits).