With the upcoming release of the new 100-400 what do you think will happen to the used value of the old lens?
The new lens is selling for a much higher price so I'm thinking it's possible that once the old lens stock dries up the used value might actually increase over the current used price.
Every man and his dog is selling up at the moment so the used price is dirt cheap.
Reason I ask is I want to replace mine with either the Sigma 150-600, 100-400 ii or a 500 f/4 IS prime (ver. i).
What's the smart play here?



