Pentax K-500 review:pared down specification, pared down performance?By Kevin Carter - Thursday September 12 2013 Sensor Review
A DxOMark Sensor rating of 79 points is an excellent score, and very close to the best tested APS-C size sensors. The sensor has a very high color depth (at 23.7 bits) and an excellent dynamic range (of 13.1 Evs).
In good lighting, these scores put the K-500 almost on a par with the best full-frame models. In our low-light tests, the K-500 also performs very well for a APS-C camera, but not quite matching much more expensive best full-frame cameras with their larger surface area and larger sensels.
Overall, with no unexpected results, the sensor performs very well indeed.