the 17-55 is a relatively older lens when you look at the 15-85, its just a design choice but my guess is Canon wants to re-design their levels and have silver ring on EF-S be a high quality lens. there are plenty of crappy lenses with the USM ring so the golden USM ring doesn't mean mid-range lens
Yeah, your probably right. Nothing to worry about then.
Im really loving my 15-85. I posted before that i wasn't sure if mine was a good one or not, i would say its god enough for a mid priced lens.
Ive done with the pixel peeping and it seems like its going to be a great 17-55IS replacement, especially considering the relatively low cost.
Golden Leaves. by dave_bass5, on Flickr