Our SQF tests found near-flawless sharpness and contrast, with SQF scores a bit below the Sigma's mid-Excellent range results. DxO Analyzer 3.0.1 tests revealed only Slight barrel distortion (0.27%), an above-average performance. Light falloff left the corners by f/2.5. At the close-focus distance of 10.87 inches, maximum magnification came in at a powerful 1:5.10. Indeed, this Nikkor significantly outperformed the Sigma in distortion, falloff, and magnifying power.