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The Tamron 28-75mm 2.8 XR Di is far superior to the Sigma.
The Tamron image quality is just as sharp as the Canon 24-70mm 2.8L just not built as well.
The Canon is also USM which is the fastest focus lens system to date.
Canon 24-70mm 2.8L USM is $1300 USD
Tamron 28-75 2.8 XR Di is $400 USD
I would recommend on your budget to get the Tamron lens
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