The aperture ring does not lock at A and moves on its own if you are not careful, the plastic cover on the sun visor is not really fixed it. At the slightest touch these drops, which is expected in the price of the lens will not be easy.
The general focus is much worse than in the 18mm - 55mm F2.8 zoom lens, especially in the corners at f F2 - F3.6 can clearly see that. I was expecting me of the lens more, a premium lens is at least not in conjunction with the X-E1.
Update 4/22/2014:
As it turned out later, the camera was defective and had to be replaced. Now the picture quality is as it should be, so the lens gets 4 stars.
