At a total score of 79, now ranked at 25:-
http://www.dxomark.com/index.php/Cameras/Camera-Sensor-Database/Pentax/K-30
Or compare it against the K-01 and K-5, here.
In fact, all the major IQ performance aspects are more or less the same as the K-01, which is not well expected as the K-30 and K-01 share the same sensor and image processor and with the same specifications on those parts.
Read Also:-
A Not-so-common K-30/K-5/K-01 Comparison of Mine
Sony Sensors Used in Different Pentax Cameras (and the Future?)