27" is far too small for 2560x1440 times four. That's roughly 220PPI - an impossible figure to work with at 100% scaling unless you plant your nose <12 inches from the panel. I've worked with 15.6" 4K notebooks, and the ability to maintain productivity when things get that small is a real challenge, never mind that a ton of software out there still doesn't work with <110PPI displays properly.