Surface area: 861.60 mm². vs. 337.50 mm². Difference: 524.1 mm² (155%) 6D Mark II sensor is approx. 2.55x bigger than 70D sensor. Note: You are comparing cameras of different generations. There is a 4 year gap between Canon 6D Mark II (2017) and Canon 70D (2013). All things being equal, newer sensor generations generally outperform the older.
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