Anyone else just bought a 5D Mark III? I did, and was curious how others are getting along with the transition.
I've been shooting a long time... started with Nikon and transitioned to Canon years ago, moving from a Nikon D2H to Canon 1D Mark II. I do a lot of sports, and actually had a youth sports business for a number of years, but mostly back to hobby now, and a little freelance on the side. I have had lots of bodies and lenses, most recently a 1D Mark III and 50D that I have been shooting with together. My biggest disappointment over all my Canon years has been the autofocus tracking shooting sports. That old D2H bettered (in my opinion) all my Canon bodies, but the new system in the 5D3/1DX I think may have changed that... just getting started with it and so far I'm impressed.
The only other crop body I owned was a 5Dc, which I had for about 6 months, rarely used, and ended up trading it for a Mamiya medium format film kit. I liked the full frame for some stuff, but it was just too slow to use for sports in any way. The jury is still out on the 5D3. I'm used to having 10fps available, but truthfully I rarely shoot bursts in sports. I tend to time the shots, and might get a 2 shot burst by accident, or once in a while do a 3-4 shot burst, but rarely does "spray and pray" ever get peak action. So I know it will be an adjustment, but I'm not 100% convinced since I've had the higher speeds available for so many years.
I have also loved the 1.3 crop of the 1D series, as a good compromise, but with the insanely large files of the 5D3, I think I'll still do fine since I crop most of my shots anyways. I want to be able to stop using just prime lenses for sports and be able to use my f/2.8 Ls. I do a lot of indoor sports in poor lighting, and have had to rely on f/2 to get fast enough shutter speeds, even at ISO3200. WIth the better high ISO of the 5D3, I'll hopefully be able to shoot at f/2.8 to get a little more focus plane, and be able to use zooms.
And then there's the benefit of being able to remove the grip and have a smaller walk around full frame camera. I do wish there was a comparably compact super zoom like the 18-200 IS I use on my 50D. If there was such a lens, I'd be able to get rid of the 1D3 and 50D, and just have a single body that does everything. Maybe has full frames become more popular and affordable, Canon will produce such a lens for them.
So now to my experience so far. I love the new AF engine so far. Being able to have tracking in AI-Servo, and be able to have the tracking focus points lit is exactly what I wanted. Wish they were red, but can't have everything. I haven't done any real sports yet, other than testing, and shooting a bit of a marathon over the weekend, but so far I like what I see.
So anyone else new to the 5D3? What are you planning to use it for, and how are you coming along with it so far?

