Netflix is "4K Ultra HD: Up to 7 GB per hour".
Blu ray is 25GB per side, so max 50GB for 2 layers. Typical movies are 35-50GB.
So, BR, and think even DVD still looks much better than any streaming service!
Interesting. I was looking back at my BluRay collection (physical) the other day, looking for a UHD movie to test with, and in my memory, all BDs with UHD, but to my surprise, very few of them were actually UHD, with most just being HD (1080p). I doubt there's in in my collection that are BD100; could I even play them? Currently using a PS5 as my BD player, and PS4 and PS3 before that.
A PS5 can play UHD Blu-Ray, PS3 and PS4 (even the Pro) can’t.
UHD discs are fairly noticeable at a distance as they usually use black disc cases instead of blue. They’re somewhat niche (if Blu-ray wasn’t already niche) and often sell at a premium, so I suspect unless you’ve been seeking them out you won’t have them barring the odd multi format bundle.
And Netflix HD (1080) is hardly what one would expect. It may be technically 1080p but the bit rate is often quite low. Most people don't notice or care.