You asked

Is the leica noctilux m 50mm f 1 2 asph sharp wide open?

The site doesn't have a sharpness test for this lens, so I can't tell you how crisp the Leica Noctilux-M 50mm f/1.2 ASPH is at f/1.2. What I can tell you is that it's a manual-focus 50mm for Leica M bodies, a remake of the 1966 original.

At f/1.2 the depth of field is very thin, so focus on the eye. The aperture and background blur notes on the portraits page explain how much room you have to work with. For a related lens with the same caution, see the Noctilux-M 50mm f/0.95 page, which says focus is very thin wide open. If you want to compare the look of your shots, sensor sizes and the Leica M11 body page are the next places to look.

Written by Claude from this site's pages.

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