Fair enough. When it comes to photography, the FF Canons excel versus m4/3. While it is a better tool, a photographer reduced to a mere GH1 or compact will still be able to produce an amazing image. "Knowing a system" is only a little bit more then reading a manual and shooting specific tests.
Getting a usable shot is much easier from a Canon/Nikon camera then others, which is a much better argument for owning one. They respond well to professional care on assignment, which in my opinion is why those two companies are the go-to for professionals. I know I'd rather hike through rain with an aging 1Ds3 and some L zooms as compared to my Arax CM/MLU; as much as I perfer images from the Arax, it is not weather sealed etc etc.