As some of you know I am going to buy a NEX 6. I was looking to get a kit but decided that I do not want the lens that comes with it. I found a body new for a good price online and was thinking of getting the Sel1855 ( used or new ). I just wanted a lens that was light to go with the camera and then later buy a canon mount so I can use all my other lenses with it. Is the SEL1855 a good lens ?