I noticed this myself, I definitely expected it to perform much better in Ray Tracing workloads, it's strange, perhaps a driver issue?
Certainly possible, there's been a number of those with the 5090 and 5080. I looked at the per-game numbers.
Identical performance with the 4080 Super at all resolutions in Doom Eternal. Maybe a driver issue? Although the 5090 didn't have an issue compared to the 4090. Doom's ray tracing probably just isn't demanding enough where better RT cores or bandwidth makes a difference at all, since it will run on a potato. So the essentially identical core count and architecture gives identical performance.
Elden Ring certainly seems to have a driver issue, or possibly the mod that uncaps the framerates doesn't work with the 50 series, both the 5090 and 5080 have huge performance regressions.
Resident Evil 4 is interesting. The RT seems entirely dependent on memory bandwidth, where the 5080 and 7900 XTX get identical performance with their identical memory bandwidth.
I wonder how the numbers look if you take out Doom Eternal and Elden Ring (especially since Elden Ring is obviously bugged), or maybe add in path tracing benchmarks. We'd probably see a bigger increase then.