It's all about percentages, Pentax has a smaller user base than C&N. Then you can also take into account the large number of P&S entries that are entered into these contests.
Then you can take into account the other reasons given above. Then you can also take into account the possibility of a bias amongst the judging panel, some of them maybe sponsored by C&orNorSony.
Then you can take into account that some people may think you a Troll.
I don't see how Pentax poor showing in contests should be affecting your decision to stick with Pentax. The photographer wins the prizes not the camera. Have you entered any contests with your Pentax? If you didn't win, did you think you might have if you had a different brand of camera?Why did you buy a Pentax in the first place?
Your question seems very naive (or Trollish).
If you had not included the last two sentences, you would not have received hostile responses.
BTW, my comments above should not be considered hostile, I am merely pointing out what others will be thinking.