I've been doing some testing with an unlocked framerate.
4K DLAA high settings - 47fps
4K DLSS-Quality, high settings - 66fps (and I surprised how often framerate can go up to 70-80fps)
4K DLSS-Q + FGx2, high settings - 116fps
4K DLSS-Balance, high settings - 74fps
4K DLSS-Performance, high settings - 97fps
4K DLSSP + FGx2, high settings - 158fps
1440p DLAA, Ultra settings - 67fps
1440p DLAA, High settings - 86fps (28% improvement compared to ultra)
1440p DLSSQ + FGx2 - 181fps
With DLSS FG the game is insanely smooth and responsive, but unfortunatelly HUD artefacts are clearly noticeable (funny enough I havent seen any artefacts arount the fast moving objects or hair, it's only problem with HUD elements, especially crosshair), so I'm not willing to use DLSS FG for now. I guess this game needs official implementation to fix the problems with the HUD elements.