The Canon 7D Mark II is a much-needed upgrade to the venerable, 5-year-old EOS 7D. It caters primarily for sports, action and wildlife enthusiast photographers.
The Canon EOS-1D X is a camera meant for advanced photographers. It's physically imposing, with a big design. It incorporates portrait and landscape shooting controls.
With a new 20.2-megapixel full-frame CMOS sensor, the Canon 1D X Mark II is here to stay. It offers a bump up from the 18MP resolution of the original 1D X.
The Canon EOS 70D's sensor is a Dual Pixel CMOS device. You get to enjoy faster focusing during Live View and video mode.