I own a 4k iMac and only noticed the big difference in quality after I understood what 4k meant. Is it worth the money? I don't know. Even though I like my 4k monitor, I couldn't care less. In my opinion, colours and price are the most important factor. It's not like the difference is that noticeable when I use other people's laptop, only when I put my nose against the screen.
(I see you're a Child of Light fan, too )