DH prefers Canon by far, more user-friendly, better autofocus on the lenses, easier & quicker to get things fixed (ie aftersales service), bayonet for attaching the lens is much easier to use, lenses are better quality, better compensation by the camera for things like shadows and skin tones for ppl. Canon is better quality for money at the cheaper end of the market. Bearing in mind that DH has used them out in real-time situations like PR photography and out in the field in extreme climatic conditions. You might be looking for something different if you're always shooting in controlled conditions like a studio.

Hope that helps.