Nikon lenses are good, but with regards to comparison of Nikon v Leitz, everybody knows that Leitz lenses are made from elements only obtainable from the centre of the earth. These elements are then hand crafted in platinum crucibles by Peruvian virgins under water and then hand ground by a recluse order of Carthusian monks over many years. When finished if put on a table with a Nikon lens, the Nikon lens will try to roll off in an attempt to commit suicide. Thus is the superior quality of the Leitz lens.