Wow, interesting! I am a designer and use the Dell, monitor diagonal 23. I can't say it was the best choice I could make. I would like to have something more professional ))
I'm surprised that Eizo ColorEdge didn't make it into the list. They are ideally suited to professional color work, especially in a larger scale situation where color consistency across multiple systems is critical. Prices are comparable to the higher end of the monitors listed here.
Also, 4k on a 24" monitor is a terrible idea. You need at least 32", ideally 40-43". Even at 27" it would be uncomfortable (and that's WITH Windows' crappy scaling).