Well... seems like u guys get in so much a heat of a debate, how about this: people change lenses all the time, they buy and sell for different reasons, and a lot buy one lens, sell it, then buy it again.
We all know it is a great lens, that all, let not compare 17-40 to 16-35 also, each person has his/her own reason to justify the purchase, we dont know.
My bad, didnt know this topic ended long ago.

