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Nice topic !
I bought a 6d on New Years Eve day and am very happy with it.
At ISO 6400 noise is negligible, like 1600 on the 7d for 4-8 sec exposures of a (moderately light polluted) sky.
But it is winter here so a high temp test is yet to be done. Next month I go to South Africa making shots of a real dark sky.
But in Feb 2012 in Bali (yes 25-30 C) I took 30 sec and 1 minute frames with my (then 4 years old 40d) but got no extra hot pixels at 1600 and 3200.
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