Andy Rouse (the wildlife tog) is currently testing the Mk111 and thinks it's awesome. He's adamant there's nowt wrong with the AF system maintaining it's all in the setup which it seems is very user adjustable and does need a bit of getting to grips with.
With regard to image libraries- he intends to submit some MK111 images to see how they're received, but the downside is it produces a 28mb image as opposed to those from the 1DSMK2 which are closer to the 50mb standard straight out of the tin. He likes it so much he would like to use it more - says the AF system is in a whole new league.