I have started a modest Blu-Ray/4k Blu-Ray collection. For me, it is by far the best movie experience I've had with any format. It takes maybe 90 vs 20 seconds to get the movie playing, but in return I get noticeably better quality. 4k Blu-Rays' bitrates are around 128 Mb/s. For comparison, Netflix tops out around 17 Mb/s. It really does look and sound noticeably better if you have the TV and surround setup to take a…
I buy blurays, rip them and then store them on a NAS to play back via Plex. Much, much better quality than any stream from Netflix et al.
I've heard that you can get efficient re-encodings, but that typically means torrenting it from somewhere. I'm not aware of a way to make high quality re-encodings locally without lots and lots of tweaking/testing/re-encoding and it takes a particular set of skills.