http://www.youtube.com/watch?v=W0y-0XxnixA
At about from 1:34 to 1:36, we can hear the shutter sound when the camera is fired continuously.
For the ease of direct hearing, I capture the sound track using the AudioThief and then crop that part and then save and upload the sound file here:-
http://dl.dropbox.com/u/4624062/K30_Shutter_Sound.mp3
So, this sound is familiar and actually it is K-r's alike, but it seems that it is lighter but maybe it is all about the recording sound level or maybe the weather sealing does really help to reduce the sound somehow.