I know that you can rescan film to get a 1080p version, but I don't know whether film has enough detail to support 2160p or 4320p. If HDR and Rec.2020 gamut are beyond what film can handle, then it's hard to say that you're being true to the original movie if somebody uninvolved in creating the movie is tweaking the dynamic range and palette decades later to make an HDR and wide gamut version that looks nothing like the original film. Since those decisions are going to be subjective, it seems like you're creating a different, but not necessarily better, version of the movie.
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