regarding the link above
"The Canon EOS 6D may deliver lower resolution images (20mp vs 22mp), however this gives the 6D the benefit of lower noise at higher ISOs. "
NO, it means that Canon has a better way to deal with color noise and banding in 6D .
It is surprising that so many test pages do not understand the difference and think that less resolution has a positive effect on high iso
As an example, the 6D with higher resolution than 1DX has better signal/ noise ratio at 51000iso than the 1dx