There’s barely any actual 4K content you can consume
I feel like that's not true. But you've gotta try. If you're streaming it, chances are it's not really any better. 4K Bluray (or rips of them...) though? Yeah it's good. And since film actually has 8K+ resolution old movies can be rescanned into high resolution if the original film exists.
Supposedly Sony Pictures Core is one streaming service that can push nearly 4K Bluray bitrates... but you've gotta have really good internet. Like pulling 50-80GB in the span of a movie runtime.