I am sure that many here (this is my first post) are already familiar with Photo Acute stacking and super resolution capabilities, but I haven't seen it used it for portraits. With the very decent shooting speed of the K5, it's actually easy to do, even handheld, as long as your subject can stay a bit still for a second.
So, a little time ago, I was having this conversation with my Nikonian friend, who was bragging about the D800 (with some merit, I have to say), and I asked him to participate in this experiment, shot with the FA 50mm at f5.6 for sharpness, 1/60 sec.
This was a stack of 6 pictures. I know the subject is not the most interesting, and it was a really cold morning and you can tell, but it was fun to see his disbelief at seeing that the "lowly" Pentax could generate a 50 megapixel image.
Here's a link to the original (no point to try to embed it here I guess)
http://www.aleatorily.com/img/s3/v42/p390454760.jpg
Here is another example of close up (still with the FA 50mm, this time at f1.4, and it's a bit softer):
http://www.aleatorily.com/img/s3/v39/p113154605.jpg
And a more stationary subject, with the kit lens.
http://www.aleatorily.com/img/s3/v42/p892338797.jpg
I just thought to share it, so that we don't focus only on the recent price increases...