Yes when writing my post I was thinking Zombleland was going to be a bad example for bringing my point across.
I'd also like to add that there's absolutely nothing wrong with standard blu-rays which is easily good enough for most of us with 55 inch or below TV's as it's barely possible to tell the difference.
I've started replacing the odd blu-ray with 4K not for the increase in resolution, but because the studio has put the effort into restoring and remastering older titles, things have improved a lot since the early days of blu-ray.
Criterion Collection are a good example they do many 4K restorations but are only released in HD and they look fantastic considering the age of many titles.
Apologies to mods cos I think were getting a little off topic.