Eye has fixed focal length, cannot focus super close. No optical zoom either. Aperture is also fairly slow. So it cannot provide shallow dof on objects further than about 2-3m away. Sensor however is pretty darn good. Not perfect either by any means though. (cannot see when too bright or too dark while electronic sensors can)

It's all about the physics. Photography = capturing light.
Sensor will get better over time. Lense? Not really.
Unless you use Diamond lenses or something.