Lack of funds at present.
My mate has one and he finds that anything over 450mm is too soft. He has got some great images from it but nothing that i have seen that is spectacular.
The one thing he really doesnt like is the fact you cant lock the zoom as when carying it around you have to watch out the lens doesnt extend and hit something.
The lens does lock and mine is sharp thru out..
I will say this that you may have a good copy and the poor ones suffer from this..the lens does shoot sharper at shorter zooms,
The lack of a lens lock is sometimes annoying