Question: What's the best sort of camera to use for photojournalism?
Answer: Professional lenses.

That's right, the glass that's attached to the camera is far more important than the light-tight box we commonly call a "camera." While professionals should utilize professional cameras (and I do), that's not the most important piece of photographic equipment in a photographer's bag. A sharp, fast lens (or lenses) makes all the difference in professional photography.