I always thought that TPM was in 2K at best, as a result of its CGI and digital composition being only done in 2K. Wouldn’t the whole film need to be re-rendered to be truly in 4K or am I mistaken?
They don’t do that for the 90% of current movies that have all their CGI and the final master done at 2K (like every Marvel movie).
WAAAAAYYYYY more 4K BR’s are upscaled 2K than you think.