Canon or Sigma 15 mmFE?

B&H price isn't that much difference, have a potential to get a Sigma lens at a fairly good price, but if the Canon is that much better I'd be willing to get it new....

Thoughts?

Chris

http://photographyreview.com/35mm%20Primes...86_3111crx.aspx

http://forums.dpreview.com/forums/read.asp...message=9662352

http://forums.dpreview.com/forums/read.asp...message=9606556