I find it interesting that anyone will switch from one system to another at a drop of a hat because of a few nuances. A few months ago it was unheard of to take images at ISO 6400 or higher, now it's "They do not perform well at ISO12800". We will have to wait a couple of more models to see ISO 100 quality at much higher levels. Hopefully. Far better to invest in good glass than follow the "Body Race". I guarantee that within the next 6-8 months, Nikon will unveil the D3x and Canon will follow suit with the 1D Mark IV. Both of which will blow the socks off anything before them and be much more camera than any photographer can handle. As long as the camera can perform to your needs, your good to go. The new 5D has most of the features that many photographers have been craving from Canon's perspective, minus a dedicated mirror lock-up button to get rid of the direct print. Yeah I wish the Af was 1D-ish, but other than that it is a solid product. The sample images are mediocre, but until I test it myself under the conditions that I am actually going to use it in, I will hold judgement. I have no idea what sort of PP were done to these images, compression, etc. As far as resolving issue with lens and sensors, that was inherent with the 1Ds Mark III and may be with the 5D Mark II. At FF 20+MP anything less than top-shelf lenses will not hold up. That includes many L's. I have that issue now with my 40D and 400mm. 2 cents.
That's what it looks like to me anyway. When I see 100% crops side by side from the D3 or D700 and the older Canon FF sensor I always point to the D700/D3 image as being far far superior in terms of color fidelity and image resolution. This new one looks like the same deal only MUCH worse.
I wanna get something pretty soon - I'm already getting bored (again) with this little A2. 
