Canon's DLC website has just put up an article on Digic 5:http://www.learn.usa.canon.com/resources/articles/2012/digic_processors.shtml
But want caught my eye was this:
"Real-time compensation for Chromatic Aberration in both still and motion images, with correction data for more than 30 lenses stored in the camera by default"
which I do not recall seeing pointed out for the 1DX. Finally Canon catches (quietly) up to Nikon.