It has some lovely pluses, the weather sealing, the tilt/twist screen is a boon for those who like low level macro shots, and it is nice and light. Oh and of course it has the same sensor as the K-3 so the image quality is fantastic!
Same sensor as the K-3, weather sealing, flip/tilt/twist screen; Size
only 11 AF points, cheaper shutter system which is noisier; strange shape behind the grip