Next week Sigma is rumored to announce two new lenses for the 2018 CP+ show:
Sigma 105mm f/1.4 DG HSM Art full frame lens – this will be a direct (and cheaper) competitor to the Nikkor 105mm f/1.4E ED lens ($2,196.95)
Sigma 70mm f/2.8 DG Macro Art lens – unknown mount/sensor/type configuration.
Update – here is a size comparison between the Sigma 105mm f/1.4 DG HSM Art and the Nikkor 105mm f/1.4E ED lenses (thanks RC Jenkins):
Via Nokishita