The 35mm is the fastest AF lens released for L- and E-mounts. The lens is not light (1,090g) or diminutive (87.8×136.2mm) but has some impressive specs.
The 14-24mm F2.8 DG DN also offers a fast maximum aperture, but is two-thirds the weight of Sigma’s equivalent DSLR lens, at 795g.
The 45mm f/2.8 is light and portable at 215g, with a dedicated aperture ring and a 24cm minimum focusing distance. Both E- and L-mount are available to pre-order now and you can get more information from here.