The KP is supposed to have a more advanced IBIS than previous APS-C cameras. From Ricoh's website: "The PENTAX KP comes equipped with the innovative sensor-shift-type SR II (Shake Reduction II), which assures optimum compensation effect for all lenses. In addition to common camera shake caused by pitch and yaw, this five-axis mechanism also compensates for camera shake caused by horizontal and vertical shift (often generated in macro photography) and camera shake caused by roll, which is difficult to handle by lens-installed shake reduction mechanisms. Thanks to a wide compensation range of five shutter steps,* it benefits a number of handheld applications, such as when using a telephoto lens or shooting in poorly-lit locations, to capture sharp, blur-free images."
DP Review has charts comparing picture usability with SR on and SR off, though they also say that it only provides a small improvement over the previous SR system:
Pentax KP Review: Digital Photography Review