Apparently, the HDR and Dolby Vision on the original saga films is pretty piss-poor. Disney also didn’t bother to even re-scan The Phantom Menace natively in 4K and instead used the original 1999 DI. This is provocatively lazy.
Hell, pretty much all their releases are sourced from 2K DIs. Even their flagship stuff like Endgame!
There is a very good analysis of the HDR aspect (or not) of the Disney+ versions here, courtesy of Vincent Teoh:
I recommend Vincent’s TV reviews, if anyone is in the market for one.