I must say that the manual for CK2 is the best yet. It's informative, well-written and has some wit, which is extremely nice in a 60-page manual. The Civilization ones were always 200 pages of extreme boredom.
I must say that I was disappointed by the manual. Compared to EU3 and HoI3 it's really lacking in content, it's simply way too short. I know it has 60 pages but I think the amount of actual content in the manual must be a 1/4 of what EU3 and HoI3 had. These two manuals had two main sections, one that goes over the interface elements and the other (more detailed one) that goes more in depth and explains the mechanics. It seems like the CK2 manual is mainly just about a tour of the interface.