Preorders: Sony 16-35mm at BHphoto. Adorama. Amazon. Calumet DE. FocusCamera. Fotokoch DE. WexUK. Calumet NL.
DC.watch posted these images and it includes a size a first size comparison with the Zeiss lens:
via DC.watch
Size comparison: Sony 16-35mm f/4.0 PZ FE lens vs the “older “Zeiss lens