James Goulden , Jan 15, 2007; 01:10 p.m.
It all depends what you're shooting and what you do with your pictures. for me in low light concerts a it's the only lens i can use in certain conditions and get a sharp bright image at 1600 or 3200
i also use the dof abilities of it to totally blur a background out and you can't do that any other way, obviously you loose sharpness of the subject but it's simply a trade off between the two.
to finish: a slightly soft picture is better than no picture at all