The resolution of the film used (unless you’re into very very old stuff) will have been far superior to what a blu-ray can reproduce
Yes but the blu ray isn’t necessarily mastered from the original film.
We’ve got old movies that are worse than DVD quality on blu ray.
Anyway there are a few recent films I’ve got on both DVD and blu ray. The difference is definitely there. Just lower definition. Things look slightly fuzzier, that’s all. Only slightly.
Of course it’s not life changing – that’s clearly extreme marketing bolx. And it’s even worse in the USA too.
I’ll take a double blind test on my set up, sitting 3m away from a 402 telly. I’ll win every time, hands down. As long as it’s a modern film.