The 5D 3 really is nothing more than a 5D 2 with - at long last - a decent af-system in it. Hardly any improvement in IQ and resolution. Blatant lack of connectivity (not even wifi which canon manages to put into any 200 dollar powershot). It should really have been called 5D 2N.
The 5D 3 is really dated in every respect.
By now i've lost interest in the 5d line and bulky dslrs. Just waiting until a really good ff milc comes to market. Af issues in mirrorless are getting ironed out. The fuji xt1 seems to be tracking moving subjects @ 8 fps. Soon enough decent af performance will also be available in ff-sensored mirrorless cams. Looking forward to it. Sony A8R could already be the real winner.
I have often wondered what your smoking before you write posts like t his, it clearly isn't what I am smoking. 5d2-5d3 is one hell of an upgrade. Others here have already listed the features so I won't bother to repeat them. You claim that it is - "a 5D 2 with - at long last - a decent af-system in it"...well then we're looking at different cameras. It's not like it was a little bump in AF. I mean, they could have slapped the 7d AF system in it. Even if they did that, way improved over 9 points. But, to go from 9 points (and with the mk2 the center point was the only one worth anything) to 61 points plus all the servo stuff they added - that's a hell of a lot of improvement in AF. And we haven't even gotten to the benefits of high ISO work!!!!
They did not just put a decent AF system in it. They put one of the best AF systems to date in a dslr in it!!!! If it was as you claimed the 5d3 would have 9 points again but all cross points and none of the servo modes. But hey, live in your dreamworld where no camera to date is capable of taking a good picture because a mirror gets in the way...