See the news: http://www.dxomark.com/index.php/Publications/DxOMark-Reviews/Nikon-D5200-New-sensor-and-new-leader
Now, the D5200 is the new King of APS-C in the DxO BenchMark ranking!
And the comparison of the D5200 against the K-5IIs:-
http://www.dxomark.com/index.php/Cameras/Compare-Camera-Sensors/Compare-cameras-side-by-side/%28appareil1%29/850|0/%28brand%29/Nikon/%28appareil2%29/830|0/%28brand2%29/Pentax
So, the K-5 is beaten and it surely loses in the resolution too, which is yet not tested as part of the DxOMark tests.