Officially announced: Sigma 20mm f/2.0 DG DN lens
Preorders:
Sigma 20mm FE at BHphoto, Adorama, FocusCamera. Fotokoch Germany. WexUK.
Reviews:
Full review by SonyAlpha.blog. Hands-on at Explora. Review by CameraLabs. Press text at CineD.
Video reviews: