From the week I have had with the 5Dmk3 I can safely say I feel the sensor is fantastic. At narrow apertures and shooting with strobes the images are razor sharp.wicked, what lenses, apertures, focus points and shooting mode are you using? They all work together but they are very specific in application. Never use servo with big glass, use spot af primarily for static subjects, use spot af for most everything for things moving rapidly use focus with assist points. You prob know all that but i just dont get how you are experiencing this other than you need to micro adjust your lenses to the body or that you possibly have a bad copy, electronics aren't perfect, some get thru to the consumers even when tested in factory to be working properly. I hope you get things worked out because with what i have been getting in testing is excellent. I dont have any gigs at the moment so dont expect to see samples at this time.
open up that aperture and shoot ambient light on my copy and it all goes to hell. My copy definately has a nutty AF, i am glad many others are reporting joy with theirs so I'll see if I can get another copy and give it a whirl.
I'd rather have the 5Dmk2 AF over the AF on my copy of the 5Dmk3 (at least I can rely on the center point of on that camer!)
I'm a bit disapointed, taking it back today I hope I can get a replacement within a week sinc ei'm going overseas and would like to use the mk3
I've stopped even bothering trying to work out servo now until I can get single shot AF sorted out,
Lenses tested are
16-35 f2.8 II
sigma 85mm f1.4
100mm f2.8L IS Macro
24-105 f4L IS
70-200 f2.8L IS II
300 f4L IS
I have set it in spot focus only (I usually shoot in spot focus anyway) I failed miserably with AI servo but I blame myself for that and not knowing the AF but I've gone back to basics and even just trying to use it the way I use the 5Dmk2 with centerpoint and recompose.
I took it back to the shop yesterday but it started working, couldnt get it to misbehave for the guy in the shop
he said regardless they have a backlog of preorders to the end of may so no chance of exchanging it and him and none of the staff had even handled the camera yet. my mk3 was the first time he had put his hands on the camera and he was the assistant manager. He suggested I keep trying it out and seehow it goes.
I definately don't have enough confidence in this camera to use it in a wedding though, studio with flash and narrow aperture though no problem It's great but apertures wider than 2.8 Its just plain unreliable.
last night i sat down to go through all the micro adjust process again but just gave up in disgust after 2 lenses