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Summary at the end of the review...
"It's still good (6d), just not as good as the Nikon".
Even if the Canon can shoot in the dark, ask yourself, or better yet search every shot you've taken, and figure out how many shots you've taken in the dark. If you've got 50k images and 5k were shot in ultra low light (and I'd be surprised if it was that high), then 90% of the time the canon's nearly sole advantage is gone. I know someone is going to say they shoot in the dark all the time (clubs, concerts, etc.), but that's not the average user.
I'm also excluding night photography, which is an interest of mine and an area where the Canon could have an edge. I'd like to see some results from both to see what kind of amp glow they produce on long exposures. While Canon has achieved very good ISO performance, I always use the lowest ISO possible and it's just not a big deal.
To me, there just aren't any really compelling features about the Canon (besides using EF lenses). They need to drop the price down to a realistic $1699 or something.