Required resolution depends on field of view, which tends to be well under 40 degrees required for "movie" style experience for most people even now However 4K

Required resolution depends on field of view, which tends to be well under 40 degrees required for "movie" style experience for most people even now However 4K isn't worth it until you get over 30 degrees, and any higher isnt worth it unless your tv is too large, at least with modern cinematic techniques.