Anyone used this lens (70-200 f/2.8 VR II) on a film body? From what I've heard, the general consensus is that these "optimized for digital" lenses are great for the 'more forgiving' film medium, but I'm not really convinced of this without some evidence. I was just trying one of these out at the local photo emporium, I really could use the AF speed, and was pretty impressed by the (fairly) light weight; still, I'm not so sure- my other options are the older models, or switching to Canon for the 135 f2/200 f2.8 combo. I really wish Nikon had some more prime choices, not just 'portrait' lenses... Any thoughts?