This is my first post here, and for some background I'm currently an APS-C user of another system with several years' experience, plus my first SLR was a Canon Elan IIE several years ago, in the film days.
I've read great things about the 6D but must admit I'm tempted by the AF system of the 5D Mk III. Most of my photography related to people and domestic animals doesn't involve fast, erratic motion and I'm not a wildlife/bird photographer. Most of my people shots are candids of people walking/riding, some portraits and group shots, i.e. not incredibly fast or complex motion most times, but on occasion I also shoot kids being kids where there can be fast, erratic motion. About the only sports I've shot in recent years are younger kids' ice hockey and ice skating, both in arenas that also have dimmer lighting (requiring up to ISO 10,000 sometimes at f/4 to get a good, crisp shot with a decent shutter speed). So of course I also need AF that will lock and be accurate in dimmer conditions.
My main hesitation with the 6D is its 11-point AF with only one cross-type sensor, the middle one I believe, whereas the Mk III is loaded with AF points, several cross-type. There are times where Servo AF is very much needed given the conditions described above. And for the record, whichever camera I buy, I'll be buying it as a package deal along with the EF 24-105L f/4 to start with. I'm not planning on buying any f/2.8 glass.
All that said, would I be alright with the 6D or is it really worth ponying-up the extra for the 5D Mk III?