John Upham wrote:
I'm contemplating buying a serious Digital SLR camera to replace my Leica M4-2 and various lenses. Any recommendations? Nikon, Canon?
As you are currently using an absolutely excellent camera already with various lenses the choice (in my honest opinion) has to be made by handling some cameras in a store and going with what "feels right" - this is going to be an emotive decision.
I am personally a Nikon man - have been for years and have multiple bodies and compacts. I started off with a Canon, bought lenses and was happy with the results. THEN I HANDLED AND BORROWED A FRIENDS NIKON D100
If I am honest, the photographs were not any better, but I enjoyed the taking of the photos more... the camera just fitted in my hand better, I preferred the position of the adjustment dials.
So, I sold and traded in all my Canon kit (at a loss) and bought into the whole Nikon package. Please don't do the same as me. Go and handle some of the equipment in a friendly store before committing to either Canon or Nikon.