Like everyone who cares about Cinema 4D, I have been playing with the demo of R14, and it's a solid release, with lots in their to get your teeth into.
The key feature that everyone seems to be talking about is the inclusion of sculpting, which when I first played with it a couple of weeks ago, seemed ok but no ZBrush. Turns out I was missing the point. I spent more time with it yesterday, and it is a really solid sculpting solution. The ability to add layers etc, is great and the baking system for when your done or want to render is also seamless and produces great results. Things do slow down at higher sub-division levels, but this is where I was missing the point.
Sculpting in Cinema 4D is designed to get you a nice usable asset for your C4D scene quickly. ZBrush on the other hand, while it can be quick, really does want you to spend hours and hours in it to the detriment of everything else (including sleep), which is one of the reasons I love ZBrush, but also why it scares me to death. The workflow for Cinema 4D's sculpting is very similar to ZBrush, and if you were a Cinema 4D user who is thinking of getting into sculpting, I would recommend learning how to sculpt using the new tools in R14, and then if you feel enjoy sculpting as a 3D creation method, then make the leap to ZBrush (or if your feeling all autodesky Mudbox). Exciting times people if your a C4D user.