The original post says that the R6 will not use the sensor in the 1DXIII.No that would cost too much money. If you want to minimize the costs and maximize profit margins in your manufacturing process, then you use the same parts in as many devices as possible. The 1DX3 is what it is not because of it's sensor. It's everything else around the sensor. Particularly it's body, power, and insanity level AF system, which the R6 wont have anything like.