How much of a difference would you see between the two lenses?
I have an opportunity to sell my f4 non IS for more then I paid for it and was thinking of putting it up for sale and using my (hidden from wife) slush fund grabbing a f4 IS.
Then taking my wife out to dinner and a movie with the extra $
Is it worth it to upgrade within the 70-200 line by 1 notch?
Thanks for any input