I have that very lens and use it on a Fuji S2. The image quality is superb however !!!!!!!!!!!!!
On my S2, the lens will focus for about 10 seconds then I have to turn the camera off and turn it on again to get it to focus again. I dont know if this is a camera problem or a lens problem. I am inclined to think its a lens problem but it might be only on mine since about 2 years ago HACKMAN dropped it on the floor for me. I had placed it on a desk about 2 feet up in the air, Hack kicked the desk and my lens went rolling off onto the floor.....eeeeeeek.
For glamour work its fine, but this weekend I had to shoot a football game for a newspaper and it really messed me up!!!!! I am going to be calling Sigma first thing tomorrow to find out whats up and will be sending it off for repair.
Before it took its nosedive, it was perfect and works well on a Nikon F5, F10 and Nikon D1X
Hope this helps.
here is an image taken with it yesterday