Nikon D5200 sensor above and Pentax K-3 sensor below. Does not look to be same sensor at all.

Our friends, moire and aliasing, don't want to leave us.

Nikon D600 :

Pentax K-3 :

In almost every shot, the Pentax K-3 had much better color quality than the Nikon D600. Also, the Pentax K-3 did a much better job of auto selecting the appropriate shutter speed while having the camera set to aperture priority. The Pentax K-3 also did a better job of rendering a more pleasing contrast in a variety of situations. Finally, the image sharpness was visibly more appealing in the Pentax K-3 than the Nikon D600.

This test clearly shows the full frame Nikon D600 does not have image quality that is nearly as appealing or accurate as the cropped sensor Pentax K-3. Plus, the Pentax K-3 is currently $500 less expensive than the Nikon D600.

http://www.digitalcamerareview.com/default.asp?newsID=5438&news=pentax+K-3+Nikon+D600+head+to+head+comparison+Pentax+wins

Camera is in stock at http://www.bhphotovideo.com/c/product/1007545-REG/pentax_15530_k_3_dslr_camera.html (includes free 32GB card also)

Camera test images at http://www.ephotozine.com/article/pentax-k-3-dslr-sample-photos-23352

Pretty positive first impressions at http://www.thephoblographer.com/2013/11/07/first-impressions-pentax-k3/

http://www.pentaxforums.com/news/pentax-k-3-full-size-samples.html

The K-3 has the most capable video mode of any Pentax to date, but the best is unfortunately not good enough to beat the competition. While the K-3's video mode has been enhanced with higher frame rates, a headphone jack, better audio sampling, and full manual controls, there are a few things that will still prevent the Pentax K-3 from being an ideal candidate for shooting videos.

One issue is the K-3 stabilizes its videos electronically, which may introduce unwanted artifacts. Sensor-based stabilization is noisy and might be audible while recording, so it seems that Pentax has decided to refrain from going down that route altogether (the K-5 did have mechanical SR in video mode, but future cameras did not). In-lens stabilization would be the best choice for video for when you're not on a tripod.

Second, the K-3's video autofocus is still very poor. There is no continuous AF, and the on-demand AF that has been added is too slow to be dependable. Furthermore, the lack of focus peaking during recording also makes manual focusing tough. This was a feature that had otherwise hoped for.

http://www.pentaxforums.com/reviews/pentax-k-3-review/introduction.html

Since the critiques of the video in the article above have to do with IS and autofocus, two things I don't use, I would be interested in the IQ of the actual vid. The video sample above has very good color and is certainly sharp--maybe even oversharpened, would like to see some more samples.

My understanding is that HDMI out is not clean but overlay with video info that can't be turned off? (Good for viewing but not recording).

DXOmark results

http://www.dxomark.com/Reviews/Pentax-K-3-review-Unshakeable-Image-Quality/Pentax-K-3-Versus-competition

ISO tests at http://www.focus-numerique.com/test-1770/reflex-pentax-k-3-bruit-electronique-12.html