The 24-105 f4L came with my camera and i dont think i like it. I never got a real chance to go out and shoot since i got my 5d but i just mess around with it in my house and it just seems to be soft at 105 and too distorted at 24. I am not enjoying the lens, but im a weirdo. :/ ... If you have one and like it, sell me on it because im not seeing a $1100 lens.