The usual applies. The 5D Mark III offers three instant-recall presets C1, C2 and C3, which makes it far better for multi-purpose use than any Nikon other than the (with Nikon, it takes a half-hour to reset everything for one kind of photo or another), but Canon is still showing some of its core incompetency in locking-out some play functions unless you stop what you're doing and and hit PLAY after each shot, and has very poor ability to set manual white balances — big differences you really will see in real photos.
The EOS 5D Mark III features state of the art in-camera RAW processing for quick conversion of RAW files to JPEG with control with control over size, brightness, WB, Picture Style, Auto Lighting Optimizer, Noise reduction, colour space, distortion correction and more. Additionally, the EOS 5D Mark III features expanded Quick Control functions during playback like image protect, image rotate, rating, RAW image processing, resize, highlight alert, AF point and image jump, meaning a streamlined workflow can begin in the field.
Below are crops comparing the Canon 5D Mark III to its predecessor the 5D Mark II, as well as to other recent full-frame DSLRs: the Canon 6D, Nikon D800, Nikon D600 and Sony A99. Though we normally start with ISO 1,600 here, we thought we'd start with the base ISO to show the best each camera can do.