Yes, Price and IQ. Let's see 'em!
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This Zeiss Flickr accounts shows a selection of images taken with the 55.. I believe this one is by Lloyd Chambers http://www.flickr.com/photos/carlzeisslenses/10185277475/#
The Sigma has the same focal length range & max aperture, and it extends just like Canon's. So what would make one choose it over Canon kit?
If the lens is real, the filter size could be a clue to Sigma trying to beat Canon in kit lens IQ, e.g. less vignetting & barrel distortion at the wide end & wide open.
That the filter size is larger and the lens being heavier is a big clue that Sigma are aiming to beat the Canon lens for IQ in many areas and this should not be too hard.
The only question this brings to mind is if it becomes to heavy, does it become less "ok" to walk around with it?
If it also becomes available in Nikon and Sony mounts then it will become a "must have" lens for the D800 crowd as it would likely trump the current Nikon 24-120/f4 in terms of IQ and a worthwhile addition to the gallery of available lenses for Sony owners.
I really don't think Canon has been waiting for Zeiss to release the 55 so we
Have something to use with a high mp camera. And I don't think Zeiss knows what canon are releasing before it's released, they assume. That being said it's highly likely a few more high mp cameras will come. Not that I in any way think this lens is at all wasted on a 5d2 or 1dx.
Expect the Zeis to be manual focus and to deliver outstanding image quality. If you think the Zeis lenses are too highly priced then they're simply not for you.