Retiring Pentax K10d for Olympus E-P3

Should get the basic black E-P3 tomorrow with the kit zoom. I've not found a reason to upgrade my Pentax until now based on my usage. The wait for something smaller and more compact has been a long one. I'm excited to try the Olympus out and hope it serves our needs for general purpose SLR and occasional video camera.

Does anyone happen to know how the sensor and pictures will compare to an older camera like the Pentax K10d when using comparable quality glass? Just wondering if they technology improved enough for the smaller sensor to have surpassed results from my Pentax.

Thanks for any insight.