I have always used my Pentax gear in wet weather -- I live in Oregon -- and have had no problems at all over years of such abuse
My cameras and DA* lenses get wet and get muddy on a regular basis. I've used them for hours at a time in steady rain. They've been subjected to sea spray (think Arctic cruise Zodiac trips) to the point that I've rinsed them off, gently, under the kitchen tap to get rid of any salt residue. They have never shown any ill effects.
Like some others here, I adhere to the philosophy that a camera is a tool to be used.
By contrast, I've had a Canon 6D (said to have "enhanced dust and weather resistance." Ha.) seize up in a very light drizzle, more like a dense fog than rain.
Pentax isn't a perfect camera system, but the weather sealing is truly very good in my experience on the K20D, K-7, K-5, K-5IIs and KP bodies as well as the DA* 16-50, 50-135 and 300 lenses.