Everyone has different opinions, but to me 21mm is the focal length that I can integrate myself into the scene. And the bokeh produced by f1.4 can easily initiate viewer’s attention to the subject in focus. Still, the bokeh is different from the one I can get from lenses of other focal lengths. Using bokeh in some distance shows the distance between the photographer and the subject. On the other hand, using bokeh in close distance shows the bokeh equivalent to the one of longer focal length but it still includes the wider background. I feel the former case more often, but anyway I should say that distance is nearly equal to stance. There wasn’t any lens with a spec of f1.4/21mm, so I just want to applaud Leica for their ambition to create such lens. The brightness allows shooting under limited lighting and variety of expressions including my personal one mentioned above. It’s extremely sharp wide open. Vignetting is noticeable wide open, but reduced once stopped down more than 2 steps. The tonality is rich and the bokeh is very smooth for the focal length. The super-sized barrel is OK because you’ll use an external viewfinder anyway, but may require some special handling. You would heave a sigh when you hear the price, but it’s worth the investment.