Here are some comparison reviews of new released Sigma 35mm f/1.2 DG DN Art lens (B&H Photo Video/Adorama) with old Sigma 35mm f/1.4 DG HSM Art lens. The new Sigma 35mm f/1.2 DG DN Art lens is twice expensive than Sigma 35mm f/1.4 DG HSM Art lens. So how is the image quality ? You can take a look at some comparison reviews below:
Sigma 35mm f/1.2 Art Vs. 35mm f/1.4 Art Vs. 40mm f/1.4 Art by Phillipreeve:
Get the Sigma 35mm 1.2 Art, if you want the smoothest bokeh, GM handling or the first 35mm f/1.2 lens with AF.
Get the Sigma 40mm 1.4 Art, if you are allergic to longitudinal CA or want the best lens in this focal length range for milky way panorama stitching. Or you prefer the 40mm focal length, obviously.
Get the Sigma 35mm 1.4 Art, if you are on a budget yet need a 35mm 1.4 lens with AF to get the job done or you mind the size and weight of the other two.