I am in process of selecting pieces for my RZ kit. On the other thread I had going, many advised, the original RZ 50mm f/4.5 W (non floating element and non ULD version) is not great. I have been advised to get the ULD version at much greater cost. In my understanding and PM by someone, floating element is often employed to correct flatness issue at close focus range. So here's a question for folks who owned this lens. In landscape type usage where lens is typically focused from say 10 yard away to infinity, how does this lens perform? I would like to hear from folks who owns or owned this lens, please. I read up plenty so I really don't need second hand information at this point.