I use a 21.5 and all of my video editing is HD 1080p and soon to upgrade my camera.
I movi is a brilliant piece of software! I would like to soon get final cut pro or after affects to try some stuff with!
I recently sold some of my video footage to sky and IYV as a free lance journalist and I couldn’t of done it without my mac!
True Grit was editied on a mac with final cut pro!
A mess about clip for my local mountain bike club:
http://www.pinkbike.com/video/212802/
Do you really feel you have moved past the computer powers?
I opted for the higher spec 21.5 i,ac as the 27” is just to big and killed my eyes!