blu-ray.com reviewers are not kind to this release. Frozen grain and some lost detail (though they still note its the best Star Wars has looked on home video to date–not saying much) due to excessive DNR.
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