Looks like I finally found some input lag measurements:
However, I cannot speak to their accuracy.
There is a reason most 'professional' IPS, which are known for having low measured contrast (500-800:1), have matte grey bezels. Example of a monitors bezel colour ruining the perceived black level of the matte monitor, which has a 1000:1 contrast ratio vs. the glossy monitors 800:1
27" 5K? Are we sitting 3 inches away?
How close do you hold a printed letter when you read it? That will be at least 300 dpi, likely 600 dpi.
You are used to 75-100 dpi on monitors. Higher dpi is a qualitative improvement. Gamers are not the intended audience.
Even for photo a 32" or 34" would be much better than a relatively small 27".
Reading text is out of the question.
Yes, it will rotate to portrait mode. As an IPS panel, the viewing angle is just as good when rotated. But I find the top of the display too high like that.
I have two UP2414Qs in portrait mode and even those are a little bit too tall. (Good ergonomics says you should look slightly downwards at the monitor, with its top roughly at eye level.
Just curious, will this monitor take one DP 1.3 input to achieve 5K whenever cards are available that support that? Or, is this monitor locked at requiring two DP 1.2 signals forever?
There are no DP 1.3 transmission controllers out yet, so new hardware would be required. I'm not even sure if this next GPU release by AMD and NVIDIA will even have DP 1.3.
For a monitor? 55" would hurt your neck.
27-30" is the ideal size for a desktop monitor. The resolution is high because they want to make it similar to the macbook retina displays where you can't see any pixels up close.