Leica M Users...how do you like it?

[tinger]

First of all I cant comment on sensors.. I haven't migrated to digital yet.
There sure is a 'Leica look'. Its basically a fingerprint...just like nikkors render images differently than Canons .. same as Kodachrome's red bias vs Velvia' green bias.
There is a lot of confusion out there between 'Lecia look' and 'Leica glow'.
The Glow look is basically spherical aberration (flaw) of the lens design by Mandler in the 50s/60s which gives a very desirable look especially when shooting portraits.

Here's a technical article re bokeh from Zeiss http://www.zeiss.com/c12567a8003b8b6f/embedtitelintern/cln_35_bokeh_en/$file/cln35_bokeh_en.pdf