Upload & Sell: Off
Today I went to the nearest park with my favourite camera for "reach", the Pentax Q. Although the birds are wild species, I don't know if it qualifies as wildlife photography, but the stationary poses let me work on a tripod with manual focus and live view, the only way to sensibly use the Pentax Q camera with long lenses. My longest lens is currently the Canon 400mm f/5.6 L, so I am in a sense focal length limited. I could of course use teleconverters, but I prefer not to have the contrast reduction and added chromatic aberrations from those, and rather work with high pixel density.
The Pentax Q sensor is only 6.17 x 4.55 mm, a tiny fraction of a FF 36x24 mm sensor. If we extrapolate the differences between FF and APS-C image quality that has been argued in this thread, one would expect this sensor to produce rubbish.
These images were taken with manual exposure at F/5.6 and 1/60 second. The nominal ISO setting was 200 on both cameras, but they were adjusted to the same brightness in the RAW converter. The same white balance setting was used, and the conversion was done with CaptureOne 6. All noise reduction was turned off, and none applied in post.
An unsharp mask was applied in CS5 to counter lens blur and diffraction. I used strength 100 with both cameras, and a radius that would correspond to roughly the same physical dimension in the image plane. 0.8 pixels for the 5DII and 3.2 pixels for the Pentax Q. Then all images had an output sharpening at final size, at 0.2/150.
I will let you judge if the image quality of The Pentax Q is fine. If you don't like it, I will accept that with no further argument, and think about why you don't like it and try to learn from it.
Finally, if anyone is still in doubt, they can see here beoynd any doubt whatsoever that higher pixel density gives higher resolution, and high quality Canon lenses are not going to be outresolved by high megapixel sensors for a long, long time.
5DII Full image
5DII 100% crop (corresponding roughly to the FOV of the Pentax Q full image)
Pentax Q full image
Pentax Q 100% crop (pixel density corresponding to a 360 MP FF sensor)
5DII crop interpolated to match the FOV of the Pentax Q crop