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Honestly I've never used the 17-85mm lens so I don't know how good it is. I would imagine that it's probably in the same quality range as the 70-300mm (similar price). If that's true then yes it is an upgrade because it's a better quality lens, gives you better IQ, etc. However, you already have the 18-55mm IS which is pretty good for a kit lens. The 17-85mm is probably sharper but I'm just not sure if it's worth the money. To me an upgrade would be like to a 17-40mm or 17-55mm.
I mean the 17-85mm going to give you about the same f-stop, a bit more wide angle coverage and more zoom. But I really don't think it's worth it. DON'T BUY NEW LENSES FOR THE SAKE OF UPGRADING. Of course that is up to you. It's just my 2 cents.
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