Thanks Oshyan, I would indeed be interested to see your spreadsheet. For that kind of money it's good to make a wise decision. The LG is not as expensive as the Eizo I'm looking at. But it has its drawbacks too. I just read a Dutch review:
The LG 31MU97Z-B is a 31 inch monitor with 4096x2160 resolution. The monitor uses an IPS panel, which usually means good color rendering and viewing angles. LG promises a maximum brightness of 320 cd / m², a contrast of 1000: 1 and a response time of 5 ms. The screen offers DisplayPort and HDMI as digital connections. The screen is suitable for modern Apple computers and other PCs with Thunderbolt connection. Thanks to the integrated USB hub you can connect peripherals such as mouse and keyboard via the monitor. Because the screen is height-adjustable, the LG 31MU97Z-B is suitable for ergonomic workstations. If desired you can use the monitor rotated in so-called portrait mode. According to our test results, the maximum brightness is 300.9 cd / m², making the screen bright enough for very bright rooms. At maximum brightness the black level is 0.35 cd / m², which results in an excellent contrast of 859.7: 1. The standard color temperature of the screen is 5491 Kelvin, which ensures a slight yellow cast. The average color deviation of 3.76 on the basis of the DeltaE 2000 standard means that the colors show a small, barely visible deviation. This makes it suitable for simple photo editing. Energy use at a brightness of 150 cd / m² is 57.2 W.
I notice it uses quite a lot of energy in comparison to the Eizo (30W).