Try Optiscaler and use XESS with DLSS inputs on AMD 6000 or 7000 series card, then compare it with FSR3.1 implementation in the same game. I have a 6700XT and on Alanwake2 and Cyberpunk, you can clearly see just how much better even XESS looks when compared to FSR3.1/3.0.
FSR4 is way closer to...