The Square Enix title is a very interesting example, because many people complained about its visuals in performance mode. The publisher did attempt to improve this with subsequent patches, but it's always looked soft when running at 60fps. As system architect Mark Cerny promised, the PS5 Pro solves these issues, offering a smooth frame rate with image quality on par with – and, in some instances, better than – the base PS5 version's 30fps graphics mode.
Once again, reading through the increasingly complex analysis, it seems like Sony's AI-based PlayStation Spectral Super Resolution is doing a lot of the heavy lifting, taking a comparable internal resolution to the original and upscaling it effortlessly with very few compromises in image quality. Digital Foundry's report does note that the technology struggles a little with areas of shallow depth of field, but overall we can see a remarkable increase in clarity and image quality.
Still, based on these early results, we've got a meaningful upgrade here: PS5 Pro simply looks cleaner running at 60fps than on a base PS5. Whether that's enough to convince you to upgrade is another discussion, but there's no doubt, for this game in particular, the new hardware is delivering a meaningful improvement. You can learn more, as well as browse some pretty nifty comparison screenshots, on Eurogamer.net.