Man of Honour
Joker was filmed exclusively with Arri Alexa cameras. They should be industry standard as they are absolutely sublime, particularly when combined with Hasselblad lenses.
I think it's probably true that the equipment used to make the film helps more than the final resolution on the disk.
There are some great 4k Blu-ray's with 2k DI's and equally some 4k DI's that really don't impress at all.