As you might expect, the Tamron performs similarly to the Canon and Nikon mount versions with the only real difference in scores being influenced by the sensor. While the Sony mount version has similar sharpness levels to the Canon mount version it’s important to remember the Canon EOS 5D Mk III sensor has a lower pixel count than the Sony SLT A99, meaning the imaging chain isn’t quite as efficient at resolving detail. Be that as it may, the lens performs very well indeed and remains a good choice for Sony users even if it doesn’t seem quite as good value as the stabilized variants.
Further readings for the Tamron SP 24-70mm f/2.8 Di USD Sony mount lens review: high image quality but does it justify the price?
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The Tamron SP 24-70mm F/2.8 Di VC USD is distinguished by being the first fast standard zoom for full frame cameras to include optical image stabilization. The fact that it does so in a design that includes a ring-type ultrasonic motor for fast, silent autofocus and a degree of weathersealing (Tamron uses the term 'drip-proof'), all at a significantly lower price than Canon's non-stabilized EF 24-70mm f/2.8L II USM that was announced around the same time, might lead you to think suspect must be some serious compromise involved in its design. But there isn't.
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