Update: I now use an OM-D E-M1 as my primary camera for work. You can read about my experience with it here.
On a professional level, changing your gear isn’t something that you want to do on a whim. In our work, everything lies in the details, and when you change the setup you use everyday, all these details must be reconsidered, from the simple familiarization with the new features of your camera, to understanding how the camera will react in any given situation. While it takes time and patience to harmonize with a new body, it is also an invaluable personal step forward, whereby you add something new to your photographic approach.