That was my primary reason. 2nd reason was the higher Megapixel sensor solely for the reason that I can crop photos and retain decent resolution/quality. Update: I misread the OP's 6D model. I thought it was the Mark I, not II. The 6DMarkII. The Mark II does exceed the 5DM3 by a little bit. The main difference is the lack of the 5D's dual card The main advantage is the full frame sensor in 6D2, which is what enables it to have better low light performance. The 6D2 also has 30% more resolution, 20MP vs 26MP, which almost offsets the natural crop factor of the 7D2’s APS-C image sensor. The 6D2 has 45 AF points, compared to 61 AF points in the 7D2. The resulting image will have less quality than when staying within the native ISO range, but it can be useful in certain situations. has sensor shift stabilization. Canon EOS 6D. Canon EOS 6D Mark II. With sensor shift, the image sensor (rather than the lens) moves to counterbalance any vibration of the camera. Canon EOS 6D Mark II – Performance, Image Quality and Verdict. Canon EOS 6D Mark II – Performance Canon DSLR’s are known for being reliable performers. After shooting with the camera for a 7qHlX.