Depends on the movie I guess. Planet Earth 2 is a jaw-dropping experience on even an average UHD-1 tv (and it's not ALL about the HDR, I've tried turning it off). Distinctly more impressive than Planet Earth 1 (FullHD only).

It's a real shame that the same store that sold Blu-Ray players didn't have it and I had to pirate it (and also skip buying the player).