The slight disadvantage of the Leica M system is the lack of tele lenses. The longest M lens is only 135mm. With the Leica SL, compatible with all the wonderful M lenses, and many others, that problem is gone. Leica recently released the 90-280mm Tele zoom for Leica SL. And Interfoto Norway was kind enough to lend me one for my trip to Gran Canaria the coming week.
These are the first test shots I made with the "Leica Api-Vario-Elmarit-SL 1:2.8-4 / 90-280 mm".