I came to this camera from Contax N Digital + a bunch of Zeiss lenses. I decided to sell the ND while it was still worth something & took the plunge into the Canon system.
Very pleased with the decision for a number of reasons -
Fast autofocus (I'm comparing with a 5 year old camera remember)
Focus tracking is great & I have had no problems with out of focus shots like 1D markIII.
Iso has a great usable range compared with the ND.
Microfocus adjustment for lenses is very useful, but my 24-70 zoom is out of adjustment at +20, and still isn't quite right. It's going back to Canon under warranty to be "tweaked".
70-200 f2.8 is a belter and matches the camera well (microadjusted to +13).
Disappointed in the lack of a good wide angle L series prime lens. Zeiss are reknown for wide angle quality, and the 24-70 isn't as good as my Zeiss 24-85, particularly in handling lens flare.
I also have a 17-35mm Zeiss, and could get it converted, but I nearly always used it at the 17mm end, so an L prime of around 18mm would be a good replacement.
It's a lot of money for a camera, but it's a lot of camera for the money - I'm well pleased with the purchase.