I've owned a 7D since shortly after its introduction. I bought a 6D this past April. On my recent trip I shot the 6D as my carry-around (still getting to know it) and anytime the light was low. I used either/or in daylight. Action (surfers, birds, etc.) in daylight was almost exclusively 7D. The dynamic range of the 6D beats the 7D hands-down. 7D AF, AF points, frame rate is way above 6D capabilities. My 7D captures almost double the frames my 6D does in the same amount of time. I don't regret buying the 6D just for the increased ability to shoot well at night, and for better detail in my landscapes. The 7D has survived so long because as a new breed it was far superior to the xxD line, and its features pushed the xD line; though it lacked xD DR & ISO capabilities most of these issues could be addressed in ppc. Marry the best features of the two bodies together for a sure winner in the 7D MkII.
I'm not sure I'd personally have made the same decision, with respect to camera usage, but I can see why you did. When I upgraded my a Rebel to a 60D, the 60D felt substantially
more robust and sophisticated. And I got great shots with it that I was able to use in professional capacities. But I've used my 5D Mark III almost exclusively for more than a year, and when I recently picked up the 60D for the first time in months, I was astonished: The camera felt like a toy. I'd always rolled my eyes when people - elitists, I once presumed - said things like that in the past, but I found myself forced to agree. I think the 6D's image quality advantage would make use it over a 7D in a lot of situations, but I can imagine someone sticking with the 7D in all but low light and tripod work, just for the ergonomics and responsiveness.
Maybe that's Canon's plan. The sensors might not be the revelation that was previously rumored, but if the 7D Mark II's build quality and other features are top-notch, maybe the sensor doesn't have to be.
I'd loved to be proved wrong on that front, though. It's interesting that this rumor, which conflicts with many in the past, has been given a CR2. Not sure if that indicates corroboration from several sources, or a single rumor from a known source. But of all the 7D Mark II gossip to come along lately, this one is both the least exciting, and, based on Canon's recent APS-C strategy, the most likely.