The ones with natural WB are k3 as per Pentax rendering intent
The blue (
) ones are Nikon as per their intent
You can easiy see which is the FF by comparing DoF. IMO the Pixel view given here the k3 is better in the full images the D600 has an edge which is what I'd expect.
I sometime wonder if some folks monitors are capable of showing the images correctly given the weird interpretations on "massive difference" which is just not there.
I suspect Bossa must be confused and think the K3 is on the left! Because the righthand (K3) images presented as his proof "At the highest ISO setting the D600 bests the Pentax (as you would expect)" has done the opposite.
The K3 images have more detail, Better Colour and the same noise footprint you can argue the reasons (I would put it down mainly to focus and DoF) but the images don't lie.
Personally I think Pentax's clear advantage against Nikon and Canon in Noise handling with the same tech sensors is because Pentax Ettr on the sensor then apply less gain in system to reach ther correct ISO wereas both Nikon and Canon apply less gain on sensor and more in body to reach the same ISO.
This means Penatax has more bits to play with and a better SNR before the data has even left the sensor.