The problem with getting a new Leica is that it is just the beginning. If you get the camera, then you need a lens. Then you need another lens, and perhaps yet another. What started out as an expensive investment then becomes a very expensive investment.
For myself, photography is a very part-time hobby, but over a couple of years I have found a way to squeeze a little money out of it. I'm now at the point that I earn enough to pay for my cameras, lenses, and other related items. I've replaced my 35mm SLR kit with an M4 and 3 lenses; a 21/3.4 Super Angulon, a 35/2.8 Summaron, and a 50/2 DR Summicron.
Personally, I don't think the quality of the images from my Leica kit are any better at all that those I got from my Canon or Olympus SLR kits. The only advantages I enjoy with the Leica are quieter operation, more compact (slightly) size, and that sense of "oh-yeah" when the numerous DSLR hobby photographers I see on the weekends stare at/comment about my equipment (it's nice to get such attention with my clothes still on).
The comparison between a VW and a Ferrari does not really apply here, a camera is a far simpler tool with much less in the way of bells and whistles. Comparing wrenches would be better. A Craftsman wrench is well-made, and is sufficient for the job. A Snap-On wrench does the same thing in the same way, but at 10 times the price. The real difference is essentially aesthetic.