I "grew up" on a D70/18-70 combo. I bought the 16-85 when I moved up to the D90 but never quite fell in love with it. You can't fault the image quality and zoom range, but something didn't quite thrill me.
When I tried the Sigma on the D7000 I realized it was focus response. The 16-85 is lazy whereas the Sigma snaps immediately into focus like the 18-70 did. Of course this is all relative, it's not as if the 16-85 takes a minute to focus or hunts, and practically speaking if you're taking your time to shoot it makes absolutely no difference. But to me, the feel just isn't there.
If you can wait a couple of months I'll gladly sell you my 16-85 at a good price when I'm next in the US. I'll be in the southwest suburbs of Chicago.