Yesterday I borrowed the SL and we had time to play with it more thoroughly.
In camera lens distortion correction
Looks like there is more that meets the eye with the SL, everybody seems impressed with the high ISO performance, me not so much, seems there is easily some banding appearing just lifting the shadows in this ISO 125 shot - and then I noticed the shape of the banding in the corner and along the top edge; It's pincushion curved... this could only happen in the camera for the DNG file and in the JPG file from the camera...to correct barrel-distortion...
The new Leica Q does this as well...
Kit-Performance
It's a really nice kit, the SL and the new zoom performs really nicely together.