Agreed. I did own the Sigma and said it was a real "L" competition lens. In ways it is but then going back, I could not see my shooting with it again.
The AF was "whirry" rather than noisy and had a habit to hunt in low light conditions (this will vary depending on conditions and user) and never seemed to be accurate enough since it lacked HSM so by the time it locked, there was an issue where the shot was either slightly different or I had missed timed.
Sharpness was impressive even wide open but I could only see this properly when using my 400D. After switching to my 5D, it just did not seem up the same job. I am not sure what it was but it didnt behave in the same way.
If I compared photos side by size without cropping, yes it was hard to tell. My reason for ditching the Sigma was not simply down to sharpness or flare but accuracy and speed to which the L just nailed.
I have had reports of 24-70L owners reporting it is pretty soft wide open, have any of you guys?
mine isn't soft wide open. any softness i attribute to the thin DOF and user error








