I've owned a small handful of these (both the first version and the second version), always hoping to find a "good one", but I was disappointed with each and every one of 'em -- softness and lack of contrast above 300mm (and of course I wanted to use it much of the time at 400mm - LOL) was the main problem. So, this ended up being one of a handful of lenses that I ~really~ wanted to love, but couldn't (and I ~do~ love some of the other Tokina AT-X and RMC lenses).
[Hmmm... Now that I think of it, I believe I still have the dedicated Tokina 72mm close-up doublet lens for it...]