Although I use and love Canon, I am not a brand advocate. I work at a full service photo lab and when people ask me which camera is best I tell them they are equally good these days. But I recently had a customer buy a cable from us (we sell accessories but not cameras) for their Nikon D800. It uses a ten pin connection and we could never be sure the cable was actually in. A customer with a pro Nikon with same connection even tried to help and he could not quite get it. This was for an adaptor cable (3rd party) to a radio trigger but I think even the Nikon brand cable release uses the same connection. The connection is so difficult to achieve that it is essentially unusable. As far as I know all Nikon pro bodies use this (while the consumer bodies use a simpler connection). No matter how good the camera is, even if it was unquestionably better than any other manufacturer, I would refuse to buy a Nikon based on this one feature alone.
I should note that the Canon pro FILM cameras (Eos 1 series) had a similar problem, though not quite as bad. Thankfully Canon realized their mistake and made a much easier connection for the digital pro bodies.
I should note that the Canon pro FILM cameras (Eos 1 series) had a similar problem, though not quite as bad. Thankfully Canon realized their mistake and made a much easier connection for the digital pro bodies.