Why is that the only thing noted on this new build is the MP count? It's moved up from the Digic 2 to the Digic 4, a much broader ISO range to match Nikon, LiveView, 1080p HD, Peripheral Illumination Correction (which is a little gimmicky seeing as it's only for JPG) and a few more things. It's not just more MP.
I believe the "yawn" from SLC Flyfishing and others I've read online...(myself included if I were a average Canon user) is:
The new features of the 5dII, most importantly will not impact my ability to "get the shot" or the final output IQ. Mathematically...yes, the IQ will be better....but in reality...no. If I compare a 50D to a 5dII...the IQ on average size prints up to the occasional A2 will be VERY comparable. So what good is 21 MP to the average photographer? There are people who will be very interested in the 5dII as a studio cam and even a possible medium format replacement. Those people...sorry, but frankly...they won't be asking the questions you're asking...they KNOW what they need and why.
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Why do you feel a *need* for the 5dII? What does it do that your current cam can not do?
What shots have you missed due to the limitations of your current cam and how does the 5dII fill those needs?
What other issues would a 5dII solve for you?...such as large prints for gallery exhibitions.
Have good, thoughtful answers to those questions? Cool...get the 5dII and enjoy. If not...look for the product that answers those questions. If you don't have any questions that arise from specific needs...then you don't need a new camera!!! Spend the money on a photog training.
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As has been said before...the 5dII *appears* to have a wonderful sensor and superb ISO performance as usual. Canon chose not to add some *pro* features, but instead added gimicky stuff with the unspoken excuse being not to cannibalize their PRO line of products. Just as the 5dmkI was a Pro quality sensor inside a prosumer body with a prosumer feature set....the 5dII continues that "tradition". It's a GOOD tradition. The original 5d was a breakthrough product on all accounts. Problem is...imo...Nikon finally got their act together and expectations have been raised...significantly. The d300 and D700 represent serious value/performance.
IMO, some of that gimicky stuff in the 5dII is pretty cool regardless, but for *me* it sure doesn't make up for a mediocre AF system, etc inside a $2700 cam...when I can get PRO features from either a used Canon 1D series or a new Nikon D700 for the same or less money. Just watch out with the 1dmkIII.
Do you anticipate exhibiting large prints in a gallery? The 5dII would be awesome for that. Again...landscapes? Awesome choice. Portraits? Awesome. You know where I'm going...I have already suggested it's strengths and weaknesses ... ad nauseam.
This perspective is all over the photog forums online...it's a "common wisdom" perspective amongst PRO photographers.
You wrote you don't want to switch to Nikon...no problem...Canon makes great gear. Just know the problems with Nikkor lens you wrote about aren't as bad as you seem to believe. The 70-200 does have some issues on FX...but the 14-24, 24-70 and others are STELLAR.
Back to the 5dII....if you just "want it", which usually translates into...
"I want bragging rights for owning the 21mp cam"...and that's worth $2700 to you...knock yourself out.