Speaking of Leica, almost everyone thinks of the Elmar and the Summicron. The resolving power of the first Summicron is a legend, and also we shouldn’t forget its rich tonality, great solidity, smooth bokeh, and enough sharpness. This lens is still non-aspheric while the majority of modern Leica lenses are being shifted to be aspheric. Maybe Leica thought this lens doesn’t need to be aspheric. Although the excellence of those aspheric lenses is so obvious, this lens is something that you find its savor as you keep using it. Honestly, if you have this lens, you don’t need other lenses. You may want to compare it with Carl Zeiss Planar T* 2/50 ZM. They are identical in terms of specs, but different in performance. While the Planar is a little dignified and flamboyant, the Summicron is realistic and serious. The choice depends on your preference. Large aperture lenses are genuinely attractive, one can fully understand why they are so attractive after s/he use this lens.