Well, I'm an emacs guy, and I've bought a vi book (O'Reilley's in fact) and not an emacs book, because I needed a book to figure out how to use vi and I didn't with emacs. Just throwing that out there.
Same here. I got Practical Vim and then moved to emacs+evil because I liked some of the vim concepts but wasn't willing to trade the usefulness of emacs. Never bought an emacs book either, after all "emacs is the extensible, customizable, self-documenting, real-time display editor."
C-h (+ k or m) is probably one of the first key chords you are to learn when starting emacs, from there everything is downhill.
