This is a classic image! Well done for braving the difficulties of shooting at f/1.2. You've pushed everything (ISO, shutter speed, aperture) to the absolute limit and hit the shutter button just when everything is sharp and the subject's expression is at it's peak. My guess is that you probably got 20 not-quite-in-focus images to get this one but that's just what you've got to do to get an exceptional one like this.
This is just the sort of image that sells lenses...
