Officially announced: World’s lightest 50mm f/1.2 lens from Sigma

Preorders:
BHphoto, Amazon, Adorama, FotoErhardt, Fotokoch, WexUK, Calumet.

Reviews (some for L and some for E-mount version):
Article on Explora. SonyAlphaBlog.

Comparison with the Sigma 50mm f/1.4:

• New lens has 40cm close focus instead of 45cm close focus of the f/1.4
• New lens has 17 elements in 12 groups instead of the 14 elements in 11 groups
• 13 aperture blades instead of the 11 blades
• 81mm width compared to 78.2mm
• 108.8mm height instead of 111.5mm
• 745g instead of 670g
• $1399 instead of $849

Youtube reviews (some for L and some for E-mount version):