7D, 40D owners

My question is to those that owned a 40D and upgraded to a 7D besides all the hype of the fancy features, what is your impression of IQ and low to medium ISO's. I tried a 50D and didn't like it, the 40D was pretty good and regreted selling it, now I'm interested in a wildlife (primarily) camera and back up to my 5D Mk II that I use for lanscape. Look forward to your thoughts and I realize this may be a little early.
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