I know I am making assumptions, but every camera since the 7D (my first dSLR) has had finer noise detail. The 80D/1DxII clearly have better shadow detail at low ISO. Banding has significantly decreased with the 7DII, 80D, etc. Even the 5DIII had less banding than the 5DII.
I would be shocked if the trend didn't continue and the recent advances shown in both crop and FF sensors didn't carry over. But...this is why I wait for others to review.