Are you just talking Star Wars? Because film != film… the actual filmstock is extremely highly variable, as are the optics at both the camera and projection ends. Very good filmstock with very good optics yields detail that IMO can exceed 2K even in the theatre. Regarding Star Wars, I believe Technicolor is one generation earlier than a typical opening-day projection print, and I believe the Silver Screen print was a dupe print, meaning it was actually one generation later than a typical opening-day projection print. Also, I’ve heard that 70mm blow-ups of 35mm prints, once projected, still show more detail than the 35mm prints they’re derived from, which is a little counterintuitive for people coming at it from the digital world.