As always " A chain is only as strong as it´s weakest link". But then how strong does the chain really need to be? I am the happy owner of a D800 and I find I get very good sharpness also with "lesser" (less expensive, not necessarily inferior) lenses. Two of my personal favorites are the fairly new 35 mm 1,4 Sigma A and the incredible 150 mm Sigma 2,8 Apo Macro with image stabilization. I have a Zeiss 50 mm Planar 1,4 but I find I most often use that as a compact 75 mm equivalent on my D7000.