I have been a Leica fan since the late 50's, owning an M3 and several lenses, so when the digital M8 came out, I had to buy it. Most of my lenses are from the M3 and they work great. Imagine that, 50 year old lenses that are sharper than any of my current Nikon or Olympus lenses.
My latest purchase was a 21mm Zeiss Biogon. Since it is not full frame, I needed a wider angle than my 35mm. How does it compare to my M3? I absolutely love it and since buying it, I have hardly used my other cameras except when telephoto is needed.