Here is a detailed sketch of the upcoming rangefinder-coupled 7Artisans 28mm f/1.4 lens for Leica M-mount:
The lens will have double aspherical glass elements. There is also already a placeholder for the new 28mm f/1.4 lens at www.7artisans.com:
The official announcement is expected by the end of the year. The price will probably be a few hundred dollars. For comparison, the Leica Summilux-M 28mm f/1.4 lens is priced at $6,595.
7Artisans lenses are available for sale at: Amazon US | Amazon UK | Amazon DE | eBay US | eBay UK | AliExpress.
Currently, there are two 7Artisans lenses for Leica M-mount – 35mm f/2 lens (see review) and 50mm f/1.1 (see review):
7Artisans 35mm f/2 lens review (comparison with the Leica Summicron-M 35mm f/2 ASPH)