DX9 can do some things better than further on versions, you do realise that?
I mean i would prefer DX11, no doubt about it, but still.
I do realize that but it's an updated engine based on old tech


EDIT: Yes the post-processing was a issue with bTransparencyMultisampling=1, it's been disabled again as it caused issues, also FXAA is active via the launcher options
LOL! same as gamebyro