OK.. to make it look Not-Awful.. must disable in game anti-aliasing, seems to be a weird fxaa filter of some sort that greatly reduces sharpness.
set resolution to 1366x768[arcade].. all of the [full] option resolutions applies horizontal stretching which screws up the image..
from what I can tell the native resolution of the game render is 1280x768.. and in 1366x768[arcade]
that native resolution is realized in the "internal scalar"
If you use say 1280x768 ingame setting.. this is how it seems to go..
it will sample put out the native 1280x768, then the internal scalar up scales it to 1366x768, THEN it downscales that again to 1280x768
so you MUST select 1366x768 to avoid internal upscaling->downscaling..