I’ve just returned my 17-35mm f2.8 EX of 10 days for a full refund, why? Like most of the reviewer’s have stated, “it’s just too soft”. The version I had wouldn’t focus all that good either, only on the best of days, weather wise, would it produce half decent results, even then, I expected better. Perhaps this was just a poor sample
I was offered the 17-35mm f2.8 DG version be way of a replacement. The focusing was way better and the images were much sharper, but in the end I went for the Sigma 15-30mm f3.5-4.5 EX Aspherical DG instead.
My only advice to anyone thinking of buying this lens is to try-before-you-buy.
If your store won’t allow you too, take your digital storage card and shoot several images, in store, using all the lenses you have short listed. Go back home, study the results and only then go back and make your purchase.