I'll buy/re-buy pretty much any large format film on UHD. I've only picked up 10 releases so far and most are titles I hadn't owned before (Apollo 13, E.T., Flying Clipper, The Dark Crystal, The Big Lebowski).
I'd focus more on stuff I haven't been able to upgrade from DVD, let alone Blu-ray...
Amadeus (theatrical cut - though, I'd probably still get the director's cut if it were remastered)
The Court Jester (Paramount did a 4K restoration that played at the TCM Film Festival last year)
Pink Floyd The Wall
The Elephant Man (1980)
20,000 Leagues Under the Sea (1954)
Around the World in 80 Days (1956)
I'd focus more on stuff I haven't been able to upgrade from DVD, let alone Blu-ray...
Amadeus (theatrical cut - though, I'd probably still get the director's cut if it were remastered)
The Court Jester (Paramount did a 4K restoration that played at the TCM Film Festival last year)
Pink Floyd The Wall
The Elephant Man (1980)
20,000 Leagues Under the Sea (1954)
Around the World in 80 Days (1956)