"i have the 2012 13"" retina i7 (2.9) already, but fortunately our business needed a machine, so it goes to that. to replace for personal use i picked up a haswell i5 2.6, 512 at the store on our discount. it's great! i was amazed how much faster the read/write ssd times are between the models
(same 512).
i did a photo job last night (wire) where i didn't have access to power for 4.5 hours on the field. i was doing p/s processing and sending pics and still had 40% power left. i went up to the press room and did another 2 hours of stock work--wanted to see if the battery would hold up. yep it went down to 25%. i was working with a set of over 1000 images.
when i returned home, did another couple of web browsing--just to see if the battery would drain out--it lasted longer than i did. amazing!! the 2012 would have tapped out 2 hours earlier.
btw, the new one actually shuts off in a few seconds (same app load) compared to having to wait forever for the other one to shut down."