I've seen some videos on YouTube that mention that the S24 Ultra's display doesn't have a vivid mode. Or it it does, but it doesn't seem to be working. I love this phone but I'm looking at my old S22 ULTRA and can see a big difference. Look at the images I've posted here. The S24 Ultra is on the left.
It's a setting on yt. It was enabled on the app, on my s24u and it just made the already dull/matt (in comparison to what I'm used to with Samsung phones) look worse because it just highlighted the flickering under the screen.