This post got me thinking.you CAN change the supersampling in a config file if you want and it does work. if you're on PC and go into the r6/config/settings/platform/pc/options.JSON file and look for "SRS_Resolution" change the max value from 100 to 200 and boom, you can now supersample and tank your FPS like me. the AA is a whole other issue however. i have found that if you turn off chromatic aberration and ambient occlusion it gets rid of some of the blur and distant shimmering.
I am on a 1080p monitor and tried DSR on my Nvidia control panal to get 1440p resolution but still tanked my fps with DLSS (quality) on. So I turned that off and played with the blurryness that is raytraced CP2077 on 1080p.
looking into the options.json and the SRS_Resolution part I edited the lines as following just to test something:
I don't know what value did the trick, min_value or default_value, just in case I changed both. That beeing said having set it to 130 the game looks soooo much sharper and the blurryness is almost gone (except the ghosting from TAA on moving objects)!
The best part is...I have NO noticable performance drop regarding FPS it feels as smooth as before with DLSS on quality all rtx options on and rtx lightning on medium. Maybe it's just placebo but I am damn sure the internal resolution got way higher.