How noticeable is the a difference between the two? I'm trying to decide whether or not its worth an upgrade. I'm mainly a desktop user, and edit video on a Mac Pro, but am looking to get an 11" MacBook Air as a portable device for doing necessary computer tasks I can't do on my iphone. I won't be doing any real editing on it, but I would like to put FCP on it for the rare occasion I want to quickly edit some 1080p h264 footage.