Catpiano

Um ... what u need to know?

It is good .. it is handy ..   even from wedding ..  at 24mm .. IS is awesome ..  even when u move up to say 50mm ..  do 1/10 sec ..  good!

Great colour, great quality ..good price ..  

Awesome for travel too, I always carry 24-105 for travel, combined with 12-24.

U can search for sample pic easy ..    ^_^

Catpiano

I will say ..  17-40 @ 24mm should have less distortion then 24-105@24mm at the edges ..  

If you only need the 24mm range from 24-105... and dont need to IS at all, stay with 17-40 or 16-35 la..

Catpiano

Yeah .. even prime .. will hv SOME distortion ...    no big deal ..