Thanks, everyone for your replies.
I went to the seller 1 hour ago ready to buy the lens. However, when I saw the lens I noticed it had cleaning marks (don't know if that's the right term) on the front element. It looked like it was dirty around the outer edge of the front-element and I couldn't clean it with a lens cloth.
I am sure this won't affect image quality, but still, I left without the lens and have to think about it.