Recently DXOMark has tested Sigma 30mm f/1.4 DC DN lens for APS-C-format Sony E-mount mirrorless cameras and said it is one of the best third party lenses for E-mount prime. The lens offers excellent sharpness, brightness and also the lens incorporates wide maximum aperture setting that boasting great light transmission of 1.8 TStop etc.
Here is conclusion of DXOMark.
The Sigma 30mm f/1.4 DN is an excellent standard prime option for Sony E-mount cameras and ranks at the top for all lenses we’ve tested on the A6000. Sharpness is outstanding, delivering excellent center resolution at all aperture settings up to f/8, with only minimal drop-off in the corners. Vignetting is pretty heavy at f/1.4, as the lens struggles to achieve the same intensity of light across the large APS-C sensor at its maximum aperture, but it improves greatly by f/1.8 and is all but eradicated by f/2.8. Compared to the significantly more expensive Zeiss 32mm f/1.8 and Sony’s own E 35mm f/1.8, the Sigma version is both sharper in the center and more consistent across the frame. Add to that the faster maximum f/1.4 aperture, and the $339 Sigma 30mm f/1.4 DN looks to be a very attractive standard prime option for Sony mirrorless photographers.
So, looking at DXO’S conclusion we will strongly recommend to every Sony E-mount prime users to buy this 30mm f/1.4 DC DN lens and also you can buy this at an attainable price of $340.