^^^ this lens is perfect for group shots and everything else... Is really wide at 17mm
Thank you. That is good to know.
I think it would be perfect for the situations you have laid out. But if you have the money to swing for the 17-55mm and aren't exactly looking to save, I would say go for the Canon. I do like the lens, but there are some quirks that I do have with the lens, such as the extremely short focus throw and lack of FTM. I've been so used to shooting with the Sigma 30 that sometimes, while my hand is on the zoom barrel, is also intruding on the focus barrel. During the focus, sometimes I prevent the lens from focusing because my hand is in the way. I'll learn to live with it, but if I had enough money to not have to worry about deciding between the Sigma or the Canon, I would have probably gone with the Canon. But the point being, the Sigma is one hell of a lens for what you pay for it.
Thanks for the info I appreciate it. Although touji made a good point but the warranty of the lens is also a big factor for me, I am convinced that this lens will really serve in my purpose. Thanks again. It is really highly recommended by others too.