I own both the 16-35 and the 24-70, and I love them both, but they are very different lenses. I was in the same boat you're in now when I bought the 16-35: I wanted a wide angle zoom and couldn't decide between the 16-35, the 17-40, and the 24-70. In the end, I decided that with a crop sensor body, the widest angle zoom *might* be the most versatile option for me. I also decided that I would regret not buying the f2.8 since I mostly shoot indoors. That's how the 16-35 became the first lens I owed--besides my kit lens.


I enjoyed the heck out of the 16-35 when it first arrived, but it was also clear that I frequently wanted more reach and that the 16-35 isn't as versatile as I'd hoped, even on a crop body. It is a thing of beauty, but not for tight shots or faces, so I found myself putting the camera down in those situations or changing back to the kit lens.


I caved and bought the 24-70, finally, which is a gorgeous, versatile lens. Sharp, amazing color. Incredible. It *is* heavy, but I don't care. I carry it with me everywhere I go.


I doubt this helps you. You'll have to decide which lens is best for you, of course. Again: I wouldn't give up either lens--I love them both--but the 16-35 zoom became a kind of specialty lens for me. The 24-70 is my reliable everyday friend.


Best of luck!!