I’m using a pimax with openxr FOV enabled and 85 render resolution in sim.
everything is maxed (ultra or high when ultra isn’t available).
LOD buildings is low 50 or so, and LOD terrain is 80 or so (CPU limited)
I get about 36 fps constant (drops sometimes to 32ish), sometimes it goes higher to 38-42 in areas…
This looks good with the 72hz refresh mode on pimax.
I’m running a 7900x3d / 4090 / 64GB / nvme4 / 2400 baud US Robotics setup. 
I’m happy with performance so far. (not saying I don’t want more, but its totally playable and looks great).
If I bump up render res to 90 it still plays good with a few more drops to low 30’s and sometimes high 90’s… 100 looks great but starts dropping frames more frequently and runs 28-31 ish.
ATM, I seem to be CPU limited as my GPU always has headroom, sometimes lots of it.
9xxx3d series in order I believe as it shows 15% or more gains in MSFS over the 7 series.
in non-VR 4K setup I have everything literally maxed LOD and all and I get 85-136 fps (136 is my v-sync limit) usually running in the 110 area.