I have the similar problem with my K-30.
Most of the shots look more or less Ok in LR. Not the same colors as in the camera JPEG, but I'd say they are acceptable.
But for the RAWs taken in some "non-standard" conditions, especially during sunsets and sunrises, LR shifts the dominating color into purple, so the clouds and the sky start to look dull. The most disappointing thing is during the import you first see the normal colors (ones stored in the JPEG preview inside RAW files), and then LR applies its color profile, and all the beauty is gone.
I've tried a lot of different color fine-adjustments in LR, but I cannot repeat the colors I want (please note I haven't calibrated my monitor, but the camera JPEGs look just fine, so I expect to see the same from RAWs).
Ok, here's a solution - when I see the LR trashes the colors that I don't want to sacrifice, I open these pictures in Digital Camera Utility v5, immediately export them into 16-bit TIFFs, and then process these TIFFs in LR. In this case, colors are 99% close to ones in the camera JPEGs