I agree on your opinion. I wanted to get 500 PF 2 years back and it was out of my budget, though I liked it so much. Now I can see used nice ones are going for $1500.Also Steve recommended that I not wait too long to sell my dslr gear as they are losing value. I now have two z8s one with the 400f4.5 and the other with the 600pf.
You think, it would drop further ? I feel it should be bottom for such a nice and sharp glass.