Leica have announced they are no longer producing this lens 

The extremely shallow depth of field at open aperture produces portraits and detailed studies of unequalled aesthetic effect. The result is outstanding image quality, comparable to the Leica Summilux-M 50mm f/1.4 ASPH., which is considered the best standard lens ever produced. Even the light from one candle can be sufficient for handheld photography.

Unlike previous Silver chrome lenses, due to awareness of weight the Noctilux 50mm 0.95 and Summilux 35mm 1.4 in Silver Chrome are Aluminium based lenses, mirroring their Black Chrome counterparts.

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A telephoto lens of uncompromising quality with apochromatic color correction, the resolution, contrast, and sharpness of the 135 mm APO-TELYT are optimal at all apertures. It also has very little light falloff even at maximum aperture and minimal distortion, resulting in top pro-level performance. This lens can render the finest details clearly and in rich contrast. As the longest focal length in the Leica M system, it's ideal for shooting over long distances and is the perfect completion of any high-class outfit. It permits distinctive landscape shots with typical telephoto effects: the foreground and background are visually compressed. Moreover, it enables frame-filling portraits to be shot from afar, so the subject is undisturbed.