I wonder where they will source the sensor. Panasonic is using Sony's sensor so Canon does have access to it. They could also source it from Aptina or Sharp.
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There are reports elsewhere that AF for BIF is problematic. Does anyone have experience of this?
There are also rumours that stocks to the big retailers are being withheld while Tamron sorts out the AF problem. Has anyone any knowledge of this?
This is the same site that confidently claimed that the older 70-200/2.8 IS was sharper than the latest 70-200 Mark 2. I would treat their opinions and testresults with extreme caution...