This is always tricky to judge but I think if we go by the deltas between the 6950XT and the 7900XTX in the slides AMD showed we can get some ballpark info.Just to get a rough idea on RT performance of the RX7900XTX
Ill use the AMD slide and Kitguru RTX4080 review since I find it to have similar fps on the RX6050XT with AMDs own slides.
Unfortunately the review only have the CP77 and Resident Evil.
Cyberpunk 77 4K RayTracing (no DLSS/FSR)
4080 = 28.1fps
7900XTX = 21fps
6950XT = 13fps
Resident Evil : Village 4K RayTracing (no DLSS/FSR)
7900XTX = 135fps
6950XT = 92fps
Nvidia RTX 4080 Founders Edition Review - KitGuruToday's launch would have marked the release of the first of two RTX 4080 SKUs... but as we know, thwww.kitguru.net
Using these numbers the XTX gets 134 in RE:V and 19.9 in CP2077
At Techspot we see Dying light hit 36 fps vs the 4080s 39 fps and CP2077 there gets 21 fps vs the 4080 31fps.
At TPU the same scaling would get a 7900XTX to 20.6 FPs vs the 4080 29FPS. RE:V is 120.6 vs 120.6
So CP2077 will probably be a big win for the 4080 in RT but the RE:V and Dying Light look pretty close with the edge towards the 4080 but by far far less than the price increase.
At 4K the 4080 does seem to lose a bit more performance when turning RT on than the 4090 does.