I just upgraded to a new 4K-capable MacBook Pro (MBP), and I'm trying to decide between the Dell P2715Q (27" 4K IPS) and Dell UP2414Q (Ultrasharp 24" 4K IPS), and have a few questions: [I've called and emailed Dell, and had several conversations with them, yet no one there has been able to give me definitive answers. One fellow said he'd talk to technical support and get back to me, but he hasn't.]
1) Has anyone seen the P2715Q and UP2414Q side-by-side? If so, do they differ at all in the aggressiveness of their AG coatings? [I want to avoid the grain/sparkles seen with overly heavy coatings.] From customer reviews on Amazon, I gather the P2415Q is the most aggressive (strong complaints on this), the P2715Q is much better (minor complaints), and that the UP2414Q is a bit better still (no complaints). But I've never seen this addressed by someone that has been able to compare them side-by-side, so I'd be very interested to hear if anyone here has (or if not side-by-side, then at least from someone that's seen both -- and is sensitive enough to this effect to be able to give me comparative information).
A Dell salesman told me 'they all have the same H3 coating, but the P2715Q has an additional polarization filter, so it's better than the other two when it comes to coating.' But I don't know how much credence to lend him. Indeed, I suspect he's wrong because, while the manuals do say all three have an H3 coating, (a) the manual for the P2715Q/P2415Q indicates both have "anti-glare treatment of the front polarizer"; (b) the latter language indicates that the anti-glare treatment is on the polarizer, it's not itself polarizing (so he likely was misinformed); and (c) user reports indicate a significant real-world difference in AG aggressiveness between the P2715Q and the P2415Q (i.e., even thought they both use an H3 coating, it could be applied differently, etc.). As a reference, I own a Dell 2408WFPb 24" Ultrasharp, REV A02 (March 09), and I'm OK with its AG, but definitely wouldn't want anything heavier.]
2) When viewed with Yosemite, is there a noticeable difference in text sharpness between the P2715Q and UP2414Q? Yosemite's text looks pretty bad on my 94 ppi 2408WFPb (24", 1920 x 1600), not much better on the 128 ppi display on my previous MBP, but acceptable on my current MBP's 221 ppi Retina display. I'm thus wondering if the 163 ppi of the P2715Q is sufficiently retina-like, or if one need the 184 ppi of the UP2414Q to achieve retina-like text sharpness?
3) Has the UP2414Q's input circuitry been upgraded to enable it to do 4K@60Hz via SST (like the P2715Q can)? When the UP2414Q was introduced, it could only do 4K@60Hz via MST, which is problematic on Macs (causes sleep/wake issues).
4) Does the P2715Q use a white-LED OR GBR-r-LED backlight? A review of the UP2414Q (www.tomshardware.com/.../...view,3781.html) reports it uses GBR-r-LED (superior to the more common white-LED, since it's more accurate natively, but more $$). The Dell salesman told me all three of the monitors I've mentioned use GBR-r-LED, but I suspect he's wrong about this as well, since the UP2414Q does nearly 100% of the Adobe RGB color space, while the P-series monitors are at around 80%.
Thanks!