It appears to have the most advanced sensor in the market. The first Back Side Illuminated (BSI) sensor in a large (APS-C) sensor package.
This is the most informative piece I found: Photokina Q&A: Can the Samsung NX1 redefine pro performance with a quantum leap in technology?
If Sony reacts to this and makes a FF sensor with BSI technology (also referred to as "stacked" sensor in Sony lingo- nothing to do with Foveon type sensors, it is still a Bayer configuration), there is bound to be a huge jump. The current Sony A7 with a BSI sensor would make me very happy.