Well, I for one am also enjoying my 5d3! Just shot a concert in a dark room with crazily changing lighting conditions on the band. AF worked pretty damn good, used zone + AI Servo and had very few shots that didn't have better than decent focus. Shot it all at ISO 3200+, lots of 6400 as well.
Also had my 5d2 as a 2nd camera (wow, I really notice the ergonomics on the 5d3 now!) and didn't really go above 3200 on the 5d2, and even there quite a few of the images aren't quite as good as the 5d3 at 6400. Plus, the single center point that I was using wasn't as fast or accurate in the changing lighting conditions.
Rented at 24-70, and I have to say, I was often using the off-center zones so the dual-cross type points didn't get as much use as I thought I would have. So even with f/2.8 vs f/4 for the 24-105, I think I'd have preferred the 24-105 for the IS which would have helped in a few shots where I think there's a small bit of blur due to being hand held. Plus the extra 35mm could have been handy, although I had my 135 f/2 on my 5d2 most of the time which was good for some close-ups.
Also forgot to mention, continuous shutter speed. On silent mode it feels a bit like the 5d2 (although pretty darn quite). Then, during a loud band, crank it up to H-continuous. Man, I got so many freaking shots. Plus the buffer is big enough that I can start shooting 1/2 to 1 second before I know the lighting/looking that I want is coming up if there's something that's repetitive and have a damn good shot at catching it. Plus it just sounds so damn cool