It seems that the shipping date for the 50mm Summilux-SL is January next year: http://leicarumors.com/2016/11/14/new-leica-sl-firmware-update-and-the-summilux-sl-50mm-f1-4-asph-lens-to-be-released-in-early-2017.aspx/ Note the criticisms that this lens is already getting for its size. I think people look at this a bit one-dimensionally, as if your only choice of lenses for the SL are the native ones. Some might wonder why you would buy a mirrorless system if you're also buying such big lenses. The answer is obvious: more accurate, more direct, more flexible (SLRs do not see exactly what the lens sees, contrary to popular belief). And this lens is probably going to at least match the Zeiss Otus, if not surpass it in almost every way. But there's something interesting going on here. The filter diameter of the 50/1.4 is 82mm. Let's compare that with the 75mm Summarit-S, which has a filter diameter of 82mm. Hmm. That's interesting. If you added a 1.4x teleconverter to the 50/1.4, it would become, approximately, a 70/2. That's 2/3 of a stop wider than f/2.5, and of course the filter diameter did not need to increase in width. That means that you can make a 50/1.4 that covers a 45x30mm sensor with a filter diameter of 82mm. It would be large, but that's the point I'm making. I'm going to make a pretty big call here: the SL lenses, or at least some of them, can cover the image sensor of the S series. That's why they're so large. Which means, at least on paper, that the next S can be a mirrorless body, and will combine the 45x30mm sensor with the L mount. A minor observation: the SL is not supposed to be a general purpose system. The M certainly is, however. It offers high performance while remaining compact, especially when you add the lenses. You can make a hybrid M-based system even more compact by using M lenses and a third-party mirrorless body.