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. 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
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Canon EOS 6D Mark II – Image quality It’s always intriguing when a manufacturer launches a new camera with a new sensor that’s never been tried or tested before. The increase to 26.2-megapixels sees it resolve an exceptionally fine level of detail, narrowing the gap to the 30.4-megapixel resolution offered by its sibling, the Canon EOS 5D
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Canon EOS 6D Mark II vs Sony A6000. Canon EOS 6D Mark II. 9.17% more megapixels (main camera) Weather-sealed (splashproof) 51200ISO higher maximum expanded ISO. 840shots longer battery life. 1515ISO higher low-light ISO (DxOMark) Has a microphone input.
There's a notable difference in weight too: the EOS R6 Mark II weighs 670g with battery and memory card, the EOS R8 just 461g. In fact, at its launch the EOS R8 is the lightest full-frame camera that Canon has ever made. Some of the difference in size and weight between the two cameras can be attributed to the bigger battery in the EOS R6 Mark II.
Low light performance on the 6D is likely to be better than the 90D. It very much comes down to what you need from a camera. Video and sports/wildlife photography where long lenses and high shooting speeds are useful favour the 90D. For landscape and portrait work, etc the 6D MK2 may be a better choice. . 171 17 387 233 301 161 356 100 251

canon 6d mark ii vs 6d image quality