it is of course apple and oranges.
I like the sharpness and high light sensitivity when I can't use flash indoor.
On the other hand, I like the 24-105mm for its zoom range, great color, and fast focus.
If only the 2 can be combined together =).
Wifey almost killed me when I go for the 24-105, i think I will lose a limb or two if i go for the 24-70, even with slicky slick, LOL