Upload & Sell: Off
Yep. I agree. I currently own the 17-55. I'm getting a 5D 3 eventually. But I'm slowly gathering gear for a full frame system. I want to start with the 24-70.
I think you can collect FF lens from other lens, such as 16 35 F2.8 L to replace your 17 55, then 70 200 F2.8 L II, 50 1.2 L . Once you get those 3 lenses, you will have 16 - 200 range (X 1.6 CROP).