You also have to take into account that full frame has something like a 2 stop advantage over APS sized sensors merely from size of the sensor alone.
So images from both 6D and 7D2 side by side would be needed to make a more informed decision.
For example my Fuji XT1 (APSc) and Sony A7r show this difference. Both are very low noise. But 2 images at ISO6400 show the Sony as being many times brighter for the same lens/exposure. Its just real estate size of the sensor capturing more photons.
Greg.
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