I carry my 13" late 2014 2.8ghz i7 MB Pro Retina 13" for photography. Size is very important. Camera bag, not a lot of space to setup and review, lots of times in the driver seat of the car with the seat back and steering wheel up. It has served me pretty well but have 2 of the new 50MP Canon's coming in a week and doing testing with the 50mp images its too slow for building previews, like 2.5 times slower. So I decided to move to a quad core. Bought a new MB Pro 15" 2.5ghz Quad Core...speed is fine but its just too big. Weight and while the extra screen real estate is nice its just too big everywhere else. I realize this may be more of a niche market but I wish they did a quad core in the 13". I'd give up battery life to be able to do it. Anyone else?