That's a very interesting post from thesuede
It would be good to see the original files and see details of the adapter to mount that lens on that camera used I was wondering if there is a bit of an extension tube effect?
Generally if something is too good to be true there is a clue that there may be a catch. Any results that indicate that a camera like the pentax q can out perform a camera like the 5d2 is an interesting result.
Outperform is a broad word without an appropriate context. The Pentax SENSOR, from a spatial standpoint, definitely outperforms the 5D II. That is a simple function of pixels per unit area, and the Pentax plain and simply has more. There is nothing really "too good to be true" about that fact.
There are numerous areas where performance can be measured and compared, in addition to the sensor. For one, despite it's greater spatial resolution, the Pentax will suffer at higher ISO due to it's smaller pixel size (which is still much smaller, despite it being a BSI sensor). It just can't compare to the significantly greater surface area of the 5D II's pixels, which should perform well at high ISO.
The Pentax outperforms in terms of sheer spatial resolution, but I would say the 5D II outperforms in most other areas, such as ISO performance, image resolution, camera build and ergonomics, the use of a huge optical viewfinder, shutter speed range, etc.