DxOMark reviewed Samsung NX1 and their conclusion is that it's the new king of APS-C hybrids!
According to the site , its sensor scores 83 points, leaving sony A6000 in 2nd place with 82 points.
They also claim that offers image quality close to that of full-frame sensors, not quite as good, but still, being just one stop behind in all categories against models such as the Sony A7r.
For the full review visit DxOMark site.