The full frame Canon 6D has just been formally unveiled as Photokina opens for the press. A competitor to the Nikon D600 (also to be unveiled today)Â this is a near identical camera to the 5D Mark III in many respects especially video it seems. But like the 60D compared to the 7D, it is cheaper and smaller. It features a new 20MP sensor but a similar (if not identical) DIGIC…