I find it really odd that they’re comparing the streaming version vs the new Blu-ray, rather than previous Blu-ray vs new Blu-ray. (Not to mention the HDR & color space issues mentioned already).
The streaming copy is compressed so terribly that it contains at least 2x less information, and normally much worse. (A great UHD disk can be up to 120mbps, compared to 10-20 on streaming if you get lucky.) So when we’re trying to compare the minutiae in each frame, it makes no sense to compare to a copy that already had a lot of information removed via compression. Also, the 4k streaming copy is nearly always worse than the 1080p Blu-ray.
The streaming copy is compressed so terribly that it contains at least 2x less information, and normally much worse. (A great UHD disk can be up to 120mbps, compared to 10-20 on streaming if you get lucky.) So when we’re trying to compare the minutiae in each frame, it makes no sense to compare to a copy that already had a lot of information removed via compression. Also, the 4k streaming copy is nearly always worse than the 1080p Blu-ray.