DF acknowledges that the PS5 port is better than the Xbox original, but not by much:

“Amazingly, the game is still better than the Xbox version running under back-compat, which is limited to a 360-era 608p resolution, with lower-res shadow maps and a darker presentation – so no Xbox enhancements to speak of. But for a native PS5 title and a somewhat high-profile port, this is a deeply odd state of affairs. Even the game’s obvious visual blemishes are preserved: shadow quality was necessarily poor back in the day, but why preserve that problem in the present day when so much more graphics horsepower is available?”

Of course, Xbox owners get the advantage of backwards compatibility for Black Ops 1 and 2, meaning they don’t need to…