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I would not give much credence to reviewers who compare lenses they have not actually used, or have only used one of them. We bought both This Sigma and the Tamron 18-270 and used them for a week in Mexico. We have a Nikon D70s and a D300, and exchanged the lenses after a few shots at the same time and place. We shot about 75% RAW and examined severe crops of the images on our 30" Apple Cinema Display before and after correction with Photoshop. Here is our opinion:
The Tamron is noticeably sharper. The Sigma is very soft except at the low-medium zoom range, and it's still softer than the Tamron over its best range. The higher distortion of the Tamron is much less noticeable and easily corrected with software. The CA is about the same for both. Image stabilization was clearly more effective with the Tamron, especially at the long end where you really need it.
The Tamron is noticeably slower in focusing than the Sigma, which is very fast for this class of lens. However, the Tamron often was more accurate and we missed several shots when the Sigma balked and did not focus at all. Over 5% of the shots we took with the Sigma were significantly out of focus, but only a few with the Tamron.
With superzooms, you pick the weaknesses that bother you less. It was a close, but fairly easy decision. Though it was sometimes annoying to use, we got obviously better pictures with the Tamron. We both agreed to return the Sigma.
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