deltoidjohn
Veteran
Just curious, but what's wrong with the 24-105 IS?
I still use it because for me it's more flexible than any of the 24-70's, but the biggest problems I have with it are:
1) Darkening at the long end
2) Very pronounced barrel distortion at wide angles.
I use it with a Speedbooster too, I think it's a great option for a general purpose lens, but I know it's not perfect and I'm careful to avoid certain situations, like straight lines near the edges of the frame. I find the IS to be incredibly good though other's don't seem quite so happy with it.