Looking forward to a new 7. I sold my 7D a few months back, since I wasn't really using it any more (got the 5D3). Certainly, pixel density is my friend, if they're clean pixels. And if they are, I'm all over it like flies on 'you-know-what'.
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The Kenko locks up the 5DIII when used with the latest generation telephotos, and you have to remove the battery to restart.
I found this to be true ONLY when AFMA is enabled. Otherwise, Kenko TC's autofocus fine at f/8 and did so prior to the 5D3 firmware update.