The blu-ray.com reviews of the 4K OT really hands the release its ass. Shame. Could’ve been a great source if they hadn’t tinkered so much.
https://www.blu-ray.com/movies/Star-Wars-Episode-IV-A-New-Hope-4K-Blu-ray/257142/
https://www.blu-ray.com/movies/Star-Wars-Episode-V-The-Empire-Strikes-Back-4K-Blu-ray/257141/
https://www.blu-ray.com/movies/Star-Wars-Episode-VI-Return-of-the-Jedi-4K-Blu-ray/257140/#Review