The original Leica SL was derided on its release. Now we have a number of manufactures who have released full frame 35 mirrorless bodies with fast AF lens.
The issue people had with the SL was they thought it too large and the lens too large. Now its being seen in a new light and has become very popular. With the new alternatives also large, people have realised you cannot break the laws of physics with lens optics.
If you want something smaller Sony have DX cropped bodies and lens and now Nikon have released the Z50 also with the DX cropped factor.
If you really want small then MicroFourThirds is still the best compromise; or take my route and use a Leica M system, if you can put up with manual focus and a range finder.
The new SL2 has been leaked and is rumoured to have 47 MP. That puts it up against the new Sony and the Nikon D850.