Okay, I'm looking to get a used MBP, and I haven't 100% decided whether to get the
Mid-2012 or the
Early 2013, but I'm leaning towards the former.
While I'm sure the Retina display is lovely, it's still effectively the same real estate, so it's not that much of an advantage to me. To its advantage, the older model is $200 cheaper, the RAM is upgradable, and so is the storage. The 2013 has 8GB and 256GB flash, but both are soldered. I can bump the 2012 to 16GB for $120, and later replace the optical drive with a 250GB 850 Pro to create a Fusion Drive with the 500GB HDD, which I can then swap out for a 2TB HDD down the road, giving me a rather speedy 2.25TB Fusion Drive when it's all said and done.
Spec-wise, they're just about identical, both using the same CPU, with the 2013 clocked 0.1GHz higher. Same Ivy board, RAM, etc. They both have Intel 4000 in addition to a GT650M, but that's where a possibly significant difference comes up, but I'm not sure how significant it really is.
The 650M in the 2013 is 1GB while the 2012 is only 512MB. Of course, the former is Retina, so it's 4x the resolution, but "only" double the VRAM, so I'm not really sure what the performance implications are there, both for general use and for gaming. Anyone have any idea? lol