The picture quality difference between UHD Blu-ray discs with Dolby Vision and regular HDR on a PS5 may be significant. Dolby Vision is a licensed video platform that uses dynamic metadata to adjust the picture on a scene-by-scene or even frame-by-frame basis, resulting in potentially more accurate and nuanced colors and contrast. In contrast, regular HDR (HDR10) uses static metadata, which may not be as effective in adapting the picture to different displays.
It's worth noting that not all UHD Blu-ray discs use Dolby Vision, and some may use other HDR formats such as HDR10+ or HLG. Additionally, the impact of Dolby Vision on picture quality may depend on the specific discs and displays being used, as well as individual preferences. However, for those who are concerned about getting the best possible picture quality from their UHD Blu-ray discs, a player with Dolby Vision support may be worth considering.