I think your probably correct with the upscaling abilities of new Tv's. Br 2049 is a good example of UDH. I have got my copy of Joker but not watched it yet, However I have DV turned off on my player as I prefer HDR and I always have lip sync issues with it so I tend not to use it.i'm starting to think that most of my underwhelm is due to the fact that the 4k tv nowdays have a very very good electronics that make a great upscaling of non 4k contents. So having a true 4k bd or a 1080p bd on those tv doesn't make that huge difference that we are looking for...on a 55" at least.
anyway, after my first trio of 4k bd i've purchased BR 2049 and Joker. Joker is in dolby vision. Both are great movies and the QP is great.
good upgrade over the regular bd. Joker in particular is a very good upgrade in dolby vision. And again....great but not mindblowing.