In terms of the raw rendering metrics, we're looking at a 1080p internal resolution on PS5 Pro with PSSR. Dynamic resolution scaling is possible, but I didn't spot it in my testing. It's also interesting that there are no clear signs of upscaling here, as you'd normally expect PSSR to resolve to a 4K image - but here it looks quite soft and 1080p-like. That leads me to suggest it might be a use case somewhat analagous to "DLAA" on Nvidia PC graphics cards - using super resolution for anti-aliasing only. It's not too bad in comparison to the base console, but a ways away from the 4K 60fps dream of the PS5 Pro.
The Pro also does a better job of hitting a stable 60fps than the base console. It's still not a perfect 60, but dips are infrequent and not very impactful to gameplay in comparison to PS5. Unlocking the frame-rate with a 120Hz display allows for higher frame-rates, typically 60-80fps. If you have VRR on, it's worth trying, though I'd probably still rather opt for the 60fps cap.