JUST got back from an EE where i had a look at the P2XL.
the screen is certaintly duller. i had RGB enabled on my 6P and nexus 5 i think was only rgb, however when comparing the XL2 with the phone right next to it in store, a samsung note 8, the screen just looked so incredibly dull even at full brightness, the whites in particular just didn't pop in any way at all. i hope on it's own it's fine and i can easily get used to it as i've always preferred this look in previous phones over the super colourful screens, however it was very noticeable this time around. i forgot to enable the vivid colours unfortunately so can't comment on what improvement that'd have made.
unfortunately the phone is wrapped in a unmoveable stand so i couldn't hold it or view the back in any way. something that did concern me though was the design of the screen to body. on my pixel 1 xl, without a case on if i close my eye i can barely feel where the edge of the screen stops and the body starts, other than it being a different material it's very smooth. on the xl2 there's a very noticable difference, almost like it's got a case on it already. i feel if i used my nail very lightly to scrap along the screen until it hit the body, the nail would catch the edge and be stopped. this wouldn't normally be so bad but because it looks like (i can't be sure as i said i couldn't hold the phone) the part where you hold the phone in your hand on the edge is where the 2 connect so you'd feel that connection line along your hand if that makes sense. if i run my finger/hand along the edge of my pixel 1 xl, it's nothing but smooth metal. if i run it along the xl2, it's where the screen joins the body and it's not smooth.
because of the curved screen edge design, though this isn't limited to the P2XL, if i were to put a case on this phone that goes slightly over the front of the screen (
such as this spigen case) i worry this will make a small almost moat like area all around the phone to collect dust and grud. my xl1 has a case similar to the one i linked to, and because the screen is smooth and flat all the way to the edge, i can easily wipe the whole area clean, but i fear this moat area will be harder to clean, and harder to use tbh with a raised case. you wont be able to follow it wrap around with your finger because the case stops you.
i'm still keeping my preorder as i'm one of the first in line, however i'm much less excited about this phone then i should be. i think had google not replaced my 6P with an XL for free, i'd be much more excited. 6P to XL has improved everything, however it feels like now if i upgrade my XL to the XL2 i will be getting some things better and some things worse.