Sigma 30mm f/2.8 DN A MFT mount lens review: Accessibly priced, compact and a good performer?By Kevin Carter - Tuesday July 30 2013 Lens Review
Comparing the Sigma with two highly regarded lenses with focal lengths just either side and at different ends of the pricing scale, we can get a good idea of where the 30mm lies in optical performance. The disparity in DxOMark score can be credited to the slower maximum aperture of the Sigma, which takes increased noise levels into account. If we look at the individual use case scores instead, we can see Sigma isn’t far behind the 45mm in sharpness and it is at least sharp where it counts (in the center), distortion is quite low (much lower than the Leica 25mm) and it has low levels of vignetting. CA isn’t too much of an issue on the Leica but it is quite noticeable on the Sigma.