http://www.adorama.com/ALC/BlogArticle.aspx?alias=The-Pentax-Q-Stress-Test-Day-1
Btw, I see nothing stressy at all although it is said so!
The posted samples are from ISO 320-6400. As you can see, those pictures are really small in size. As usual, for those web-sized photos, they should look okay whatever they are produced from, even with cameraphones, frankly.
Nevertheless, that fashion photographer seems to be quite like the Q. She tells us that her Canon 7D and 24-70/2.8 were put aside because of the Q (with the prime lens mounted, as seen from the EXIF). So, this must be another big victory by Pentax, whom has successfully entered the professional commercial photography field and kicked Canon out of the market, at least for instance! ;-D