Now, of course, what you are all silently asking is how does the SL/50 Summilux combination compare in size to the equivalent M set up. Question no more.
The 50 Summilux-M is already more than a decent performer and many consider to be the best lens for the M cameras. Putting one on a M (Typ240) will set you back around £8.5k, so you would expect it to be good. Well, not just good. Outstanding. The real question here is how much better is the new lens, which when attached to the camera will represent an investment just shy of £10k. That is not something which I will be investigating with my own resources, but I will certainly be interested if anyone on the forum wants to give it a go.