If you are looking at buying a 24mm fast lens, it is going to be either theCanon 1.4Lwhich comes in Mk I(discontinued)and MkII, or Sigma24 1.8. You can find reviews of either lens on the web, the Canons are nicely covered by Brian.


As far as other focal lenghts go, I would recommend the Canon 50mm 1.4 or 80mm 1.8, each of which costs a small fraction of what you would pay for the 24L Mk II.


Anyway, I have a funny hunchthat there will be more "mistakes" made in the future [:P]