I used to do a lot of bird photography and still do some, but transitioning from crop bodies to the 5D2 has left me wanting more reach - even with a 500 + 1.4x attached. Because of this the 1.5x greater linear pixel density of the 7D has significant appeal to me.
That said I think the AF performance of the 5D2 is actually quite good on the center AF point (which is really all I ever use). So I wonder if the new 19 point AF of the 7D might be overkill for me. In short, I think we 5D2 users already have a camera that's "good enough" for bird photography, and can wait awhile until reviews of the 7D - glowing or scathing - start to trickle in. If eveyone loves the damn thing I may try to pick up one as a 2nd body on sale in the spring, but the 5D2 is good enough that I'm not going to be in any particular hurry.
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