In my testing so far, I have found the Canon 6D RAW files when put through ACR 7, can have the exposure lifted by 5 stops and banding is nowhere to be seen. Sure there is noise, but at 5 stops it is to be expected. For my landscape work, I never find myself lifting more than 3 stops, which my 5D2 would start to get fussy and start banding in the red channel. I have yet to find any banding at any ISO up to 1600 for pushing shadows. Obviously the DR begins to diminish with increased ISO, but so does Sony's sensors and they are all equal from ISO 800 and up for DR. I go up to ISO 800+ often for controlling shutter speed at dusk when doing landscapes, so in those cases, Canon and Sony are on equal ground.
It could be argued that the 6D has the best sensor Canon has ever made into production. High ISO is great and the DR is also great at ISO 100. I also find the color channels to be very balanced and not overly blown out in the reds like my 5D2 was.
Of course it would never hurt for Canon to make the DR better and better, but for my uses in doing landscape work, the available DR in the 6D is what I would have expected from the 5D2 had it not been so prone to banding, which ruins shadows pretty easily.
I might post some samples once I get more time to prove this, but in the meantime, I am thrilled that Canon has given a good look into improving every one of their sensors that have been delivered in the last year. They just keep getting better and better.
Any other 6D owners notice this too, or am I just lucky? 

