This particular lens comes with a Leica M mount. The aperture on the lens ranges from ƒ/16 to ƒ/1.4.
From London Camera Exchange
Leica Summilux-M 35mm f/1.4 ASPH. - Silver
WEX Photo Video
Leica 35mm f1.4 Summilux-M Asph Lens - (11 Blade Aperture) Silver - Sliver
Clifton Cameras
Leica 35mm f1.4 Summilux-M ASPH Lens - Silver