I'm certainly not an expert but I do notice a difference between 4K and Blu Ray disks. Sometimes it's not very noticable but every time the 4K looks and sounds better than Blu Ray or streaming. Also my reasoning is if I'm buying a film, I'll spend the extra $5/$10 get it on the best format available and then never have to rebuy it. Here is a comparison I found for 2001 Space Odyssey and you can see much brighter colors and sharper lines for the 4K disk.
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