4K UHD "upgrades" where the original BD is better

[Taylor3978]

I've seen some people say that they regret upgrading to UHD for a title (often selling off the BD) because they feel the BD was actually better. Is there a thread where people can report on disappointing "upgrades"? If not, perhaps this can be the one.

I realize there is room for contention, but why should this thread be different from any other. Let's at least confine the discussion to PQ, not to discussion of extras.