[Rover]

To be honest, the Sony and Canon 50/1.8 are at least adding one aspherical element each to the design, like the Nikon 50/1.8 G did. That might stand for something, but at the heart, they're still harking from the Belle Époque. But not all 50/1.8 have to be the same, so I don't understand the notion that a lens with these parameters just absolutely has to be small, cheap and simple in construction.