Lens shopping at Kuala Lumpur Airport?
I have no idea what lens prices are over there. I just know that I wouldn't buy a camera there because here in Europe the prices have come down so much that the difference is not worth the risk you're inevitably running.
With a lens I would risk it even less. Many lenses seem to have such a widespread quality that it seems you have to be prepared to exchange a lens once or twice.
That wouldn't be easy or plain impossible back in Europe or the States.