Are 4k discs worth it?

Hey y'all, in my lifelong pursuit to spend money, I'm debating on whether or not to get a good 4k player to get the 4k discs. Is it really that much better than streaming in 4k with surround? I have a very reliable and fast internet connection so I'm fairly sure I'm getting the best quality available for streaming (although I'll rabbit hole that later) just wondering if it's really that much different for video and sound quality? Help is as always much appreciated

Edit: I have a 65 inch c4, a decent 5.1.2 set up and a ps5