Just an image to show how ridiculously huge this Sigma 50 f1.4 Art for native E-Mount is on a Sony A7III (Compared with the Tamron 28-75 f2.8 : r/SonyAlpha
Tamron is Working on Five f/1.4 Prime Lenses for Mirrorless Cameras | PetaPixel
6 key points of the 50-400mm F4.5-6.3 (Model A067) starting from 50mm 'standard' focal length | Impression | Special Contents | TAMRON Photo Site for photgraphic lenses