5D and 24-105 is like a point and shoot. hardly u change lenses..
best walkaround for a full frame.
But on a cropped body the lens become a little narrow at 24mm. There is definitely a world of difference @24mm between a full frame and the 1.6x crop.
24-70 when they come out with the IS, it may become the standard walk around.
I want 24-70 F2.8 IS just for the heck of it