I have uploaded a bunch of images to Flickr taken during the day with various lenses.
My initial thoughts are that I will probably not use my K-3 at all from now on.
The AF is faster, the ergonomics are good, the Live View button is placed where my fingers belive that play back is so I start Live View alot, it is heavy, the IQ is really, really good, the Pentax 1.4x TC gives dark corners when used with the 150-450 but with the 10-17 or 16-50 it works just fine. Maybe a little dark corners on the 16-50... Don't remeber right now...
Well:
Click on the images for some enlargement and click to the left for the K-1 images.
Have fun!
https://www.flickr.com/photos/thomashedlund/26752889086/in/photostream/