I had several good lenses and the 17-55 IS was only my last acquired lens becos I stubbornly "hang" on to L only.
I was using some good lenses such as 24-70L, 24-105L, 17-40L, 10-22 ... ... BUT when I had tried the 17-55IS, I was like wtf ... I should have bought the 17-55IS as the first lens!
I was using some good lenses such as 24-70L, 24-105L, 17-40L, 10-22 ... ... BUT when I had tried the 17-55IS, I was like wtf ... I should have bought the 17-55IS as the first lens!