The new Sigma 105mm f/1.4 DG HSM Art lens is now shipping in the US (Nikon version is already in stock) as well as in Europe (Foto Hans Keuzekamp).
Sigma is now also shipping some of their prime Art lenses for Sony E-mount (check in-stock status).
All of the latest Sigma lenses are pretty big in size - see the attached pictures:
Via NikonRumors