Leica 28mm f/1.4 Summilux-M ASPH Finally Starts Arriving
See all my wish lists as well as the Leica M wish list at B&H Photo.
See my reviews of Leica 28mm lenses in Guide to Leica.
If I were to pick one 28mm lens for Leica M, it would be the new Summilux (I own the 28/2 and 28/2.8 models but the 28/1.4 is out of budget).
Looks like the drought has ended. Some 28/1.4 lenses already have shipped, and B&H says more coming soon.