I believe your current set of lenses is entirely adequate. From personal experience, I could only think of the Zeiss ZF 100/2 Makro as being significantly superior for macro, landscape and general photography. You might want to have a look at Lloyd Chamber's blog, http://www.digilloyd.com. I consider him to be one of the more competent internet gurus. He is currently doing an extensive evaluation of lenses for the D800E.