HDTVTest evaluates the OT and ST in HDR on Disney+
https://www.youtube.com/watch?v=VGZmMjPJiAk
Vincent of HDTVTest is a respected reviewer and display calibrator. He doesn’t get into color grading or anything like that, but it’s an interesting look into whether the OT on Disney+ is true HDR or just some contrast tweaks (spoiler: it’s not real HDR).