NEX's APS-C sensor, needless to say, is way larger than GF6's M4/3 sensor. In fact, it's the same sensor that was used in Sony a57, Nikon D7000, Pentax K5 & K5-II. These are all well-known models that feature incredible image quality. The 16-50mm lens although has disadvantages on distortion and poorer corner sharpness, it's focal length is very useful for daily shots and landscape.

GF6 on the other hand has more lenses, but you won't probably buy all of them, so the statement of NEX having less lenses doesn't really affect in reality. I personally think that those good M4/3 lenses are quite overpriced. You really need those good Zuiko lenses or Leica-certified lenses to make your GF6 stand out from NEX.