An anomalous event: the Leica 50mm f/0.95 Noctilux-M ASPH has been out of stock for years, but it’s currently in stock at B&H (at least as I write this).
There is nothing like it for the look at f/0.95, but ironically it is as good and perhaps better than the slower Summilux when stopped down to f/5.6.
The unique look
The Noctilux has a unique look, but is best used on the new Leica M Type 240 because it can be difficult to focus accurately with the rangefinder.
See various images from the Leica 50mm f/0.95 Noctilux-M ASPH in Wide Aperture Landscapes in DAP for examples and general tips.
Pick up a 60mm polarizer and neutral density filters as well, since these are mandatory in bright conditions at f/0.95 (max shutter speed of 1/4000 is not enough).