864.00 mm². vs. 861.60 mm². Difference: 2.4 mm² (0.3%) 5D Mark III sensor is slightly bigger than 6D Mark II sensor (only 0.3% difference). Note: You are comparing cameras of different generations. There is a 5 year gap between Canon 5D Mark III (2012) and Canon 6D Mark II (2017). All things being equal, newer sensor generations generally
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