The release of the Sony Zeiss 50mm f1.4 for full frame E mount cameras begs the question "just how many 50mm lenses does one need?" In truth, just one--but the strategy is a smart one for the company. You see, years ago camera manufacturers used to offer loads of different lens options. You'd get a 50mm f1.8, f1.4, f2, etc. Leica still does this and to some degree, Zeiss does too. But with Sony, you're getting something different.