I've read this requires a MDP to USB-C adapter. Just curious as to the performance. Also which adapter do you have. Side note: The LED Cinema Display is old, I know. I still love the design and next to my 2012 21.5" iMac the screen looks fine. But how will it look next to a 27" 5K screen? Just wondering before I buy an adapter if I'd be better off selling it for $300 and buying a new 4K LG for about the same price.