Well to be honest I've been looking at Amoled screens for a really long time! I'd say my first real go with it was back when the original HTC Droid Incredible released on Verizon quite some time ago. I kind of fell in love with those colors, those deep blacks, and than came the Samsung phones with all the glory that saturation brings.
I always had 2 lines, So one line was a business phone and the other a personal. To me i had the best of both worlds, always had my iPhone since the first one launched- straight thru until today with the X, and a separate line, usually an android phone which today is an S8.
Want my honest opinion, it's nice on the X! Is it mind blowing and amazing...I could say yes...if you get a good one! Or I could so no, because I've seen a lot of variation in the screens, but that's expected...This is apples first run with oled. However I can honestly say my 7plus did indeed have a very nice screen, as did a lot of iphones before it. Apple had the best LCD screens on a phone I'd say for many years now.
However I will just come out and say it, the note 8's screen is just better in every way, it's beautiful!!! Does this make the X's screen crappy? Not by any means, I think the iPhones X's screen is very good, just not better than the Note. I guess one could argue this is apples nicest screen on an iPhone? Well I won't get into that because we still have tons of people on 6, 7, and 8's that would say different. IMO it's a really nice screen, like I said...provided you get a good one without a ton of color shifting!
I expect the next go around of iPhones next year to match what we would call the best. It's apples way, this was ok, but the next will be amazing...it's how they keep selling us! I hope so, because every time I see a note 8's screen I'm wowed once again. Sorry X just doesn't have that wow factor.