DxOMark completed their full in-depth review for 24.2Mp sensor inside the Canon EOS M6, And the Canon EOS M6 Mirrorless Camera gets an outstanding overall DxOmark score of 78 points, just 1 point behind the better-performing Canon EOS 80D (79 points). Really great!
DxOMark from Conclusion:
While early EOS M-series mirrorless cameras underwhelmed a little, the new M6 has the features and image quality to be a serious contender in the hybrid market, as long as you don’t want 4k video.
For photographers considering an update from an older EOS M, M2, M3 or M10 model, the improved specifications make the M6 a worthwhile upgrade. While the exclusion of a built-in EVF is probably a deal breaker for serious enthusiasts, they aren’t the M6’s target market, with the larger DSLR-style EOS M5 still in the Canon lineup to meet their needs. Of course you can add the accessory EVF to the EOS M6, but that adds $200 to the price, makes it bulkier than the M5, and limits the use of the hotshoe for a mounted flash, so not ideal.