With the new revised version achieving an overalll DxOMark score of 21 points, the Sony mount version performs very well, although not quite achieving the same high scores when compared to the VC version when fitted to either the Canon EOS 5D Mk III or the Nikon D800. In terms of Sharpness scores the Sony combination matches the Canon but Transmission is lower at 3.1T vs 2.8T while Distortion levels are very slightly higher. The Nikon duo achieves higher Sharpness scores (17P-Mpix), and has slightly lower levels of Distortion but the Sony pair have marginally lower chromatic aberration.
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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