Happy you made your choice. Since a couple of months I have the Eizo CG2700S (2560x1440p) next to my 5k iMac, and I like it very much. Way better for photography/editing...and preparing for print. I don' t do video at all(shooting/editing) and with my images I now can actually see what I do. Editing/noise reduction/sharpening/etc. And ofcourse colour accurate for printing. For viewing iMac is very nice (like watching those 4k videos from internet). But for accurate photo editing...Eizo beats it hands down. Ofcourse if there' s no need for this, then the iMac is superb. I feel I have the best of both worlds now.
Congratulations on your choice.