Different strokes I guess, also, everyone looking at these bodies has their own needs to fill. For me, I have a mk3 so this would be a backup body. Yeah, the price difference isn't that huge (in the sticker at least, it's closer to $1200 difference after tax though). To me, that is the cost of a 135 f2L. If your on a mk2 looking to upgrade though, then yeah the 6d may not be as big of a leap as you want. But if your on a 60D, then just the FF sensor alone is reason to buy! Different strokes!
And if you're an a 50d? That's what I am and I feel that the 6d would be a downgrade in several ways:
- Maximum shutter speed
- Flash sync speed
- AF-Point distribution across the viewfinder
- Ergonomics (the joystick is missing, so I cannot switch AF points easily)
- Burst rate
- SD instead of CF cards
That's why I am still not sure how my "way to FF" should look like. If the 6d specs were similiar to those of the Nikon d600 I think my decision would be clear. But now I think I will go 5dMk2 (which is still much cheaper than 6d when bought used), so Canon won't be seeing any of my money.
In fact, IMO already the 60d was a downgrade from the great 50d in several ways (worse ergonomics + missing AFMA coming into my mind).