These 8 shots are a comparisons of the Sigma 15 2.8; 14 2.8; 15-30 3.5; Zenitar 16 2.8. They are shot at 2.8 (3.5 for the zoom) and f11. The best of 4 MF shots was selected for each. You be the judge. The 15mm is $450; the 14mm is $900; the 15-30 is $520; the Zenitar 16mm is $169 and requires an adapter (up to $80 additionally.)