For what it's worth, Apple Cinema displays, despite being quite old now (e.g., having a USB2 hub, not USB3) have very good corner-to-corner color quality. Out of the box, Apple gets you 99% of the way there, which for anything short of critical color proofing is really all you need.
Other monitors seem to vary a lot. I splurged on the
Sharp 32" 4K monitor, whose price seems to be on a nice downward trajectory, but it's still not cheap. An external calibrator is mandatory for this thing, and there are definitely corner-to-corner brightness shifts of the sort that Eizo explicitly says they correct for. But, oh so many beautiful pixels! And even for my own photographic purposes, the not-quite-perfect is still entirely good enough.
I suppose the key question you should ask yourself is whether you want to do all the other things that tend to go with professional pre-press, like having specific-colored reference lights for your environment and blocking out that messy daylight which may shift in color temperature over the course of the day.