Kayaker, Clean at ISO 3200 depends on what you consider clean. I found the 7D usable to ISO 1600, and Canon claimed 3200 (with 6400, and 12800 as HIGH modes). Assuming I continue to accept one ISO less than Canon, then ISO 16000 / 2 = ISO 8000 should be acceptable.
I'd love to get the extra low-light capabilities over the 7D (and 1Ds2, where ISO 1600 is also the max usable setting), but yeah, I'm not jumping on it without sample images, someone doing AI Servo tests, etc.
edit: Said "/ 8" instead of "/ 2"... oops! But the intention was clear.
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