DXO recensisce il nuovissimo Sigma 18-35 e, com'era prevedibile, le prestazioni sono da urlo (tanto da paragonarlo al superlativo e costosissimo Canon 24-70 II):
http://www.dxomark.com/index.php/Publications/DxOMark-Reviews/Sigma-18-35mm-F1.8-DC-HSM-A-Canon-mount-lens-review-fixed-focal-length-quality-in-a-zoom (http://www.dxomark.com/index.php/Publications/DxOMark-Reviews/Sigma-18-35mm-F1.8-DC-HSM-A-Canon-mount-lens-review-fixed-focal-length-quality-in-a-zoom)