Also I heard there was problem with some of these lenses with glass elements splitting... the hazing effect. Either way, you should always check the lens in person for hazing and leaking lubes. Otherwise, but them from trusted source like KEH.com.
Once I bought a AF-D F1.4 50mm from ebay and there was lube leaking inside. I sent it back and the seller claimed that I was scamming him so I reported it to ebay. Ebay gave me my money back.