update so far the BG is working good after 1 year usage (ard 20times) no peeling and battery still able to communicate. however the battery life compare with original depleted 30% away.
i am a user of 8-16mm. the extra mm make a big diff. the only draw back is the is f4.5-5.6 so when come the night a tripod is needed. is a fun len to play with on people (big head shot) or landscape.
http://www.the-digital-picture.com/Reviews/Sigma-8-16mm-f-4.5-5.6-DC-HSM-Lens-Review.aspxthere is one more that u missed out which considered as a "more" ultra wide. sigma 8-16mm! btw i am using it. fun!
see here for the review
i owe both s90 and s95. i will recommend s100 for the reason on the burst shoot where you want to capture ur toddler expression and action. plus it is F2.0 =]
i will be buying 8-16mm sigma over 10-22 canon because i love the extra 2mm.
see this comparision. http://www.the-digital-picture.com/Reviews/Sigma-8-16mm-f-4.5-5.6-DC-HSM-Lens-Review.aspx