The thing with Leica is that they're not "back to basics", they were "always basic", in their M-mount rangefinder range at least. They've kept the same basic structure since they started, camera, lens, shutter, viewfinder.
Compared to a Leica, my 7D is gimmicky. Look at all the buttons down the left of the screen. The Q is useful, or was to begin with, but I rarely use it now. Picture styles? never touched it. Print? Printing direct from camera without a PC? That's a gimmick for the masses (yes, I can see very rare occasions when a pro might use it, but rarely). Play, trash, info, menu, of course I use them. Even the RAW/JPEG button I use to use when I shot jpg-only, now i don't touch it because I shoot raw-only.
All those "creative" functions of the lower-rebels are missing on the 7D, the cheaper you get the more gimmicky they are. But even the 5D3 has a "rate" button. That screams gimmicky to me (but it may be useful even to pros, i just don't use photoshop).
Leica's got none of that. just a shutter, and a lens. That's not even a mode-dial, that's shutter speed. Buttons are on the back, Play, delete, menu, set, and a dedicated button for ISO. All things you need to take a basic photo, the rest is up to you.
I read a review of the S2 that said "it's a camera, but it's also a work of art" (A work of art for people who can afford Picasso Originals, of course), "no fancy buttons that do 'creative' things", (no R&D money spent on different fancy functions to impress the masses, like creative picture styles and video), "just a camera with damn good IQ".
But there's something about the leica name, of course, kind of like a Rolls Royce or Aston Martin. The badge adds price. Quick ebay search gives me $2300 for an M3, $1500 for an M4, $6000 for an M4 with lens, €48,000 for an M4 with lens!
(I presume that's some special collector's edition or so). I also just saw a lens hood, just the hood, go for €1676
. If that's not worse than L-Fever, I don't know what is...