Some real official Series X gameplay in Dirt 5:
https://www.resetera.com/threads/dirt-5-xbox-series-x-4k-gameplay-ice-drifting-and-rally-racing.304655/
Looks pretty good, definitely impressed with the graphics in the high fidelity mode. However the Era thread points out the game looks bad sometimes in a couple of the modes and suffers from a lot of issues like shadow pop-in.
Here's the 4K quality mode:
4K performance mode:
1440p 120fps mode:
iirc all these modes are available on PS5 too.
i really can't see the shadow pop-ins ect. all i can see is the 16 and 10 second load times. horrible stuff there.