The Olympus 45mm is a quarter of the price and is optically excellent and bright enough for almost everyone. At this price, I can't see the Leica being popular.
Also, at this price, why isn't it weather sealed?
It's nice to have this glass as part of a system though.
Due to the shallow depth of field which is unique to the large aperture lens, even a slight handshake can potentially cause images to be out-of-focus. However, the POWER O.I.S. (Optical Image Stabilizer) which is integrated in the LEICA DG NOCTICRON 42.5mm effectively compensates for not only small, fast movement but also large, slow movement, making it easy to capture super clear shots even when shooting in low-lit situations such as in night time or indoors.
Somebody from marketing needs to revise this. OIS isn't going to help missed focus due to a shallow depth of field
Panasonic G3: 9-18mm, 14mm, 20mm, 45mm