I would love to get both lenses as I'm sure they are both very nice. But looking at my current line up of lenses, Sigma10-20 f4 and the Canon 50mm 1.8, I need a general zoom lens as well. I was looking at the 24-70 2.8, but it is very pricey, and I'm about to pick up a 7D. So I'm now considering the Tamron 17-50 2.8 and the 85mm 1.8 as these 2 lenses combined are cheaper than the canon 24-70. What do you think about that?