In addition to the 28mm f/5.6, today TTartisan also announced a new 23mm f/1.4 APS-C mirrorless lens (35mm equivalent focal length). Pricing is not yet released, but you can check the official website for updates. The lens will be available for seven different mounts, but Sony E, Fuji X, Canon M, and MFT will be released first:
TTartisan 23mm f/1.4 APS-C mirrorless lens additional information:
Sample photos can be found here.
TTartisan lenses are sold at: