Thanks to its highly corrected optical design, Sigma’s new full-frame 35mm f1.4 HSM A achieves the highest DxOMark score in this group but, unexpectedly, sharpness is slightly lower than the $325 Sony DT 35mm f1.8 or the ultra-fast 35mm f1.4 G. However, bear in mind with the latter model there’s only a slight improvement in center sharpness when stopped down and there’s a hefty $470 premium to consider. In all other respects the Sigma is the better-corrected model.

Sigma 35mm F1.4 DG HSM A Sony8992611
Sony DT 30mm F2.8 Macro SAM3002212
Sony DT 35mm F1.8 SAM3252113
Sony 35mm F1.4 G13692113
Sony 28mm F2.8 2701511
 

As for the DT 35mm f1.8 it has consistent sharpness from edge-to-edge when stopped down to f2.8 and beyond on the A77, while the softer, wider apertures make it particularly suitable for environmental portraiture.

At $300, the modestly priced Sony DT 30mm f2.8 model is good value as both a macro and a ‘normal’ lens. It has good central sharpness but this never extends to the outer field, the edges or corners, even when stopped down. That’s disappointing in a macro but not so much of an issue for a general-purpose standard lens.