so yea...does anyone actually HAVE the 24-70/t2i combo?
Here's the Sigma 24-70 f/2.8 HSM on the T2i. This lens is 3.7" long (vs. 4.9" for the Canon, which is not quite the length of the hood in this picture) and 3.5" wide (vs. 3.3" for the Canon). This should give you an idea in terms of lens size on the camera. The Sigma is $500 less than the Canon and is optically a bit better. However, the Canon has a little better corner performance, flare control and is weather sealed if those are important to you.
If you need the extra length of the 24-105 vs. the one-stop loss in aperture, IS is desirable and you're ok with the poorer bokeh, then you should probably get the 24-105. However, I am rather impressed with the T2i's high-ISO performance (it is only about 1 stop lower than my 5Dii) and I've shot it at 3200 with very good results. So in that regard IS becomes less of an issue. I also think that since you do a lot of indoor shooting, then you should really consider a fast prime and that also lessens the value of the 24-105.



