I used to own the Canon 70-200mm f/4L IS and it was sharp as a tack. I really was a fantastic lens.


I bought the Canon 70-200mm f/2.8L IS II as I needed the extra stop (i.e. f/4 vs f/2.8). My experience so far has been that the f/2.8L IS II is as sharp at f/2.8 as the f/4L IS was at f/4. Stopped down to f/4 it is much sharper again. I really enjoy using the new f/2.8L IS II.


It is possible that you