As great as using picture styles like CineStyle to acquire a very flat image for the maximum amount of post grading, the truth is HDSLR video codecs aren’t very strong and can fall apart quickly if pushed too far in post. If you are able, getting the image right in your camera is always the best option.
Stillmotion put together this great tutorial showing just how far you can push your image right in the camera. I’ve done this often myself but never for stylized work. They show you how you can completely change the feel of your video with just a few button presses.