Basically, if you shoot RAW, this lens is not very good with vignetting and distortion, and sharpness in the corners are not great either. This reminds me of the 18-55mm kit lens that came with the NEX-5/5N. Horrible distortion and similar soft corners. But, I think as a kit lens, the faults of the 16-50mm lens is bearable. It does offer a much wider angle than the 18-55mm at similar prices. When bought as a package with the camera, this lens is only $150, less than half the price of buying by itself.
It is disappointing that the 16-50mm lens is not better. Sony relies on software correction for the design flaws but this does not do any good for RAW shooters like me. But, I will probably buy it with the camera anyway, if I decide to buy the NEX-6.
Pink Tulip - Canon 1D Mark III & EF 100mm f2.8L IS. click for larger.