Across various 4K bluray rips I saw, they don’t look anyhow better. It’s what it is.
I honestly think a lot of that has to do with how confused and weird the whole UHD thing is on a tech level. There’s no standardized “HDR” format, and the need for an “HDR” format doesn’t even honestly make that much sense, especially not when you see how it’s been applied.
Most consumers didn’t even really understand the benefits of what 1080p were offering, or how to appreciate them correctly, before the industry started running 4K at them. For a lot of people, 1080p = “motion smoothing on, icy blue colors and 16x9 at all costs” and that’s what “HD” was.
And then for 4k they added something like 3 different “HDR” formats, none of which seem to have anything to do with making stuff look better, just louder. And accuracy to what it looked like when it was shot is completely out the window, and nobody has a standardized way to get the picture info back to what it was supposed to look like before these artificially pumped-up grades were applied, so everything becomes a guessing game of “is this what it’s supposed to look like” on a player-to-player basis.
4K didn’t need to be the unnecessary mess that it currently is, and I think a huge part of why the format won’t ever take off is due to that mess. You can’t reliably put a disc into a player and have it look the way the directors and cinematographers intended it to look when they made it, and that sucks.
Maybe when this coronavirus basically relegates movie theaters to nothing more than blockbuster theme park rides (Disney will probably own all exhibition in five years and LITERALLY make them theme parks for Marvel, Star Wars, Disney, and Pixar releases) someone will figure out how to make the cheap 4K smart TVs we’re all buying (because they’re the only option available anymore) reliably display a standardized image that looks great and takes advantage of the resolution AND the color gamut without dealing with competing and incompatible formats.