It's a known issue with DX12.

Originally posted by VladimirIlich: Sadly this still not fixed. Character looks so bad this way, why keep it unfixed?

We don't plan on keeping it unfixed :P We've solved it internally but it's not the kind of thing we need to rush out in a hotfix.

Run DX11 or potentially fiddle with a character shading setting (the name escapes me and I'm not at my desk)