When on my PC, I'm looking at either my (older) Asus PA246Q (24.6", 1920x1200, 98%+ aRGB, 12 bit colour LUT, 10 bit panel), or my much newer Dell UP2516D (25", 2560x1440, 100% aRGB, 14 bit colour LUT, 12 bit panel).

Needless to say, both are calibrated, and the Dell is somewhat better than the Asus.

Very few (if any?) 4K monitors are 100% aRGB ... so didn't get considered.