The sample images from it looked amazing, hopefully the average consumer copy will be able to deliver the results they are showcasing.
Since the Tamron I've had a constant fear of long superzooms needing way too much AF adjust between nearest and farthest zoom lengths. The Sigma had me at hello with that feature (USB dock) alone almost.
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I have the same with the Tamron, about 16 AF fine-tune stops of difference between 150mm and 600mm which is why I shoot her at 400mm only. I can only set one adjustment and would have to do the others manually each time I change the focal length.