I was discussing both cameras from a company, marketing viewpoint, which is what I thought you were aiming for, not from what I would buy personally, which by the way, would be neither camera.
But these comments assume that Canon decides how much dynamic range the camera/sensor will have. Canon makes their own sensors. They designed this one, they added the DPAF feature, and it came out of the silicon foundry after 18-24 months of R&D (which is how long it takes) and it performed the way it did. Presumably, perhaps, the cost of the 5Div sensor was cost-prohibitive for the 6D2, so they had to use the sensor they had. Even if the 5Div sensor could be affordably used in the 6D2, its higher resolution could perhaps add a lot of other costs, such as memory buffer size enlarging, frame rate being reduced, etc.
This notion that lower DR is some sort of diabolical marketing plan of Canon is silly. They have a history of using the best (Canon) sensors they can. For example, the 6D had a better-performing sensor than the 5D Mark III. The 80D has a better-performing sensor than the 7D Mark II.
I've worked in product development for a very long time, and sometimes, your product just isn't as good in some aspect as you want, but you don't have the time, money and/or people resources to correct it. The 6D2 was already late to market.
The 6D2 is a significant upgrade over the 6D in every aspect except DR:
- 26 mp vs 20 mp
- Articulating screen
- Dual pixel autofocus greatly improves video shooting and LiveView stills
- Frame rate boosts from 4.5 to 6.5 fps
- Video increased from 1080p30 to 1080p60 (still not 4K, but...)
- Touchscreen
- More viewfinder focus points
- Faster CPU means faster AF, higher frame rate, more responsive
Those are significant improvements. For most general-purpose photography, this camera is outstanding. And, we know that the desired DR boost is only a benefit under very specific shooting conditions and when you post-process to boost RAW shadows. Otherwise, it's not a feature. I think, quite frankly, this camera is being unreasonably maligned.
With all that said, I still prefer my 5Div, because I shoot concerts in very dark halls. I also move focus points constantly (which the 6D2 doesn't easily allow) and I Rate my photos as I shoot them for faster review later. I love the identical control layout of the 7D Mark II and 5D Mark IV. But that doesn't put me in the club of disliking the 6D2 or believing it's a Canon "conspiracy" of some sort. It should be very obvious to anyone that Canon Engineering is amazingly talented and fanatically-devoted to photographers. It is among the greatest of all Japanese engineering and it is very much a quintessentially Japanese engineering feat. DPReview had an article about Canon's master lens makers which is absolutely amazing. The L lenses are built by master craftsmen with decades of experience.