For the last year I've been searching for a <24mm prime. I did have some requirements for this new lens;

1. It should be flare resistant.
   I hate flares on my wide-angle lenses (my Nikon 17-55mm, and Sigma 10-20mm)
2. It should be small (as small as possible).
   Not a 'look-at-my-camera-with-this-huge-lens' lens.

After much deliberation I bought the Voigtlander Color Skopar 20mm f/3.5 SL II @ Robert White (direct link) in the UK.