I'm having the opposite issue. Previously running mid-high settings and it ran ok while looking fabulous. Now I can max the settings but many objects are blurry, the ground glows and everything is washed out, distracting pop-ins... No idea where to even begin.
EDIT - I can get close to normal by enabling FSR ultra. Interestingly, each FSR quality step dramatically changes the brightness. The experience posted above was no-AA, which is what I prefer overall so hopefully it gets some love before release.