The world fastest zoom lens for APS-C sensors just got tested at Focus Numerique (google translated) and Digifoto (no translation because images will not be displayed by google). And both reviewers came to the same conclusions!
FN writes: “The results of the new Sigma zoom are impressive and worthy of a professional optical 24×36 mm f/2.8 zoom!”
Digifiti noticed as only limit the high chromatic aberration: “We were surprised again after seeing the test photos. You expect from a zoom lens at fully open aperture somewhat lesser performance in the corners. The Sigma 18-35mm f/1.8 however scored exceptionally well, even at the 18mm f/1.8 corner tightened remains very good. The bokeh of the lens looks very stylish, and distortion remains well within bounds.”
The Sigma 18-35mm f/1.8 (here at BHphoto) isn’t yet available for preorder as Sony A-mount. But as I told you last month they will certainly release the A-mount version within the year!
P.S.: Some image samples can be seen at Dpreview too.