[Brightcolours]

Well, the exchange rate has gone so wild since then that I wouldn't really win anything now. But I could have back then.

Not that the 24/1.4 L is a bad lens by any measure... I'll take comfort in the fact that it's weather sealed unlike the Sigma (the only glaring omission in the A series lenses... almost looks like they looked for a reason to create a flaw in it! )

It is weather sealed, and it may focus faster and more accurately (Canon USM). That the Sigma does better in corners wide open is not that important, as usually the subject is not in the corners. So, I would not think about it too much, unless you run into something in particular.