My opinion about the screen Dell UP3216Q / 4K
Reading consumers reviews about this screen I unfortunately haven't had the opportunity to try yet is enough to understand that Dell's "top-range" screens don't suffer from the lack of homogeneity that strikes the manufacturer's first-price screens. This UP3216Q Dell monitor gives you access to both Graals of photographers or video editors: large size with 32" and 4K in the same screen. I guess it must be very beautiful! Calibrate it right away just to be sure... it's still Dell! - Read Amazon buyers reviews
It is a Dell screen so I'm always a bit more cautious before recommending them but obviously, top-range Dell screens are a lot more homogeneous than their low-range little brothers. The price of this UP3216Q for a very large size of screen and 4K in addition is absolutely unbeatable!
My opinion about the screen DELL UP27155K - 5K
As for its 24" pals, the colors will be excellent once calibrated but the screen won't have the uniformity nor reliability of an Eizo. You never quite know what to expect when you receive a Dell screen. Is it a problem? Not always! Calibrate it right when you receive it, just to be sure! - Read Amazon buyers reviews
Dell screens are beautiful, well-finished and their colors are very good once calibrated, especially here in 5K... but well, homogeneity and reliability are always a bit behind and you never quite know if you're going to get a good serial number with Dell... They are truly cheaper than their competitors though.
My opinion about the screen Eizo CG248 / 4K
The whole ColorEdge Eizo 2016 range is all about superlatives! This 24" screen with 4K is obviously a reference if you really need it because the texts become very, very small as well as the thinner details in our images, even at 100% in Photoshop – this is an exceptional video monitor though!
I'd given the CG277 11/10 so I can't wait to try Eizo's 4K screens, even if I think 4K is more adapted to 27" screens at least, considering the level of resolution they reach!
My opinion about the screen Eizo CG318 / 4K
I haven't calibrated this screen yet but being very familiar with this brand, I know that we're once again in front of an absolute reference! 4K of EIZO quality, deep blacks and displaying all of the wider photo and video gamuts – Read Amazon buyers reviews
You're probably buying the current reference of screens!
My opinion about the screen Nec SV PA322 / 4K
Even if Nec offers a 4K screen of a great quality through this product, they're currently letting Eizo triumph in the top-class range... However, this 4K doesn't have competitors under 3,800€ and is thus an alternative solution for photographers. Video makers, be careful because this screen doesn't display DCI-P3 natively.
In absolute terms, it is still an excellent 4K screen without direct competitors, fortunately for NEC!
Summary > Buying guide monitors 4/4