Sigma 50mm f/1.4 DG HSM Art Lens for Nikon F 311306 B&H Photo
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 ...
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) - Nikon Rumors
Head2Head: Sigma 50mm F/1.4 DG HSM Art vs Canon 50mm F/1.8
Re: Sigma 50mm Art - Zeiss 55mm ZA - Nikon 50mm 1.8G: Nikon SLR Lens Talk Forum: Digital Photography Review