Nikon 50 f/1.8S vs. Sigma 50 f/1.4 ART+FTZ: Nikon Z Mirrorless Talk Forum: Digital Photography Review
Sigma 50-100mm f/1.8 DC HSM Art Lens Review
Review: Tokina Opera 50mm F1.4 Lens (Nikon F Mount) - The Phoblographer
Sigma 50mm f/1.4 DG HSM Art Review
Head2Head: Sigma 50mm F/1.4 DG HSM Art vs Canon 50mm F/1.8
Nikon 50mm f/1.2 S Review: A Battle Against the Sigma 50mm f/1.4 Art | PetaPixel
Sigma 50mm f1.4 Art review | Cameralabs
Sigma 50mm F1.4 DG HSM | Art — SIGMA Canada
Sigma 50mm f/1.4 Review
Nikon Cameras & Lenses - New Nikon Z 50mm f/1.8 S lens review and comparison with the Sigma 50mm f/1.4 DG HSM Art lens (Nikon wins): https://nikonrumors.com/2018/12/06/new-nikon-z-50mm-f-1-8 -s-lens-review-and-comparison-with-the-sigma-50mm-f-1-4-dg-hsm ...
Sigma 50mm F1.4 Art DG HSM Lens for Nikon : Electronics - Amazon.com