I think XanuFoto may have hit the nail on the head.
The 5D2 was considered a good camera for studio and landscape use, where the ancient autofocus and slow FPS were less important, but they have now changed their tack a little by giving us solid improvements in those areas, and also making the low light capabilities so much better.
Nikon have now gone from a relatively low-res sensor to one bursting with megapickles, but the FPS is still slow, and from the comparisons that I've seen, it's not as good in low light as the 5D3.
So, they are different horses for different courses.
Personally, I think Canon did itself a diss-service by not giving the 5D3 a new name and they should have tried to distance themselves from the 5D2, as the 5D3 is, to me at any rate, more a cut-down 1Dx.
If they would have called it a 2D for example, or a 4D (I wouldn't call a camera a 3D unless it was a real 3D camera) a lot of the crap that is floating out there would have hit the road by now and be forgotten.
Personally, I'm definitely going to get one, but I'll wait a couple of months for all the dust to be settled when I'll be able to drive a hard bargain on one, because the retailers will have them sititng on the shelves and al the dust would have clreaed away.
They would have probably done one or 2 firmware upgrades by then too.
I think Canon have been smart. Instead of giving us a camera that is really only suitable for one or 2 genres, they've given us a really usefull and competant all-round camera that can still be used in the studio, or for landscapes, but can still cut the mustard with action and low-light shooting too.
Where the 5D2 was more for serious landscapers and studio work, the 5D3 is great for advanced amateurs like me who want a camera that can do everything.
Because of its new found speed and low light abilities, I reckon the wedding photographers will also be standing in line to get them too.
I agree with your observation. The camera is good, a nice "Allrounder". Which shouldn't be compared with the D800, but thats whats happening right now, due to the poor Marketing.
The Canon Marketing failed big time in this case.
Mistakes done so far:
The time of release to the market (the cam looks like it was designed for an earlier release like 8-12 months go or so),
the product name - they should have called her 6D and announce a high MP Cam too,
the decision to milk the 5D MarkII cow even longer
and the pricing itself of course should have been far lower, at least for the EMEA market (EUR & GBP);(they gonna get it back via the lenses anyway).
They lost the momentum, which is crucial when releasing a long awaited product.
Anyhow, I'm very curious how Canon will react to the situation. With price decreases, discounts, vouchers, tons of advertising and bought reviews, announce a high MP Cam in advance, or release a 5dMark3v2 in 18months... we'll see?
The worst thing they could do is just sit and wait, like they have done often in the past, when you loose the momentum you need to action.
I'm also going to wait until the dust settled and hope for a nice price around christmas...
my 2 cents
PS and still, the D800 would suit me better I fear, if there wouldn't be this awful Nikon grip and GUI, the Canon just feels perfect in my hands...
PS2 lets see what happens when they ship the 1D X ....