On the nikon forums it is generally understood that Nikon maps the tones to emphasize picking up detail in the shadows . This comes at the expense of compressing the midtones . This of course gives the Nikon files better high ISO performance at the expense of mid tone separation . This can be seen in any situation where Nikon shares a sensor with Sony . Same sensor different in camera processing .Been doing these tests a lot myself where the Nikon lacks is mid tone contrast. Try a little clarity on the Nikon when your processing. Better yet apply it at 100 percent and watch it being applied . I found about 15 to be pretty nice. And yes it's a little tough telling them apart. The big difference right now is the tech cam just kills the Nikon in usage as the Nikons can't get close on the wide end of the world with shift, swing and tilt. So the beauty for me is having both.
Of course the Nikon smokes the tech cam in other areas. Freaking can't win need both systems. Lol