Well, I'll cut against the grain here and say that 4k is absolutely noticeable, especially when there is proper HDR calibration on top of it. When you watch a good video that's purposefully recorded in 4k HDR, the difference between it and 1080p is startling. I've a 40" 4k hdr10 TV, and some of the stuff on Youtube is absolutely beautiful to look at. Not all 4k HDR content is created equal, and therein lies the problem. Some films will look good, some not so good, and Dredd doesn't really benefit too much from the 4k upgrade simply because of the way the film is lit and the way it intentionally has that gritty look to it, which was noticeable even in the theater. If anything, the 4k looks like an upscaled version, not unlike older films like The Matrix and Saving Private Ryan. It'll take a while, but the benefits of 4k HDR will matter a couple of years down the line when the standards for it sorts itself out, because right now it's a bit of a minefield where distributors can slap a 4k HDR sticker on something when in reality it really isn't true 4k HDR.