Nothing special -- just testing the 85mm 1.8G -- I am really pleased with the lack of high iso noise. I've just been shooting it with Auto-ISO on and it works perfectly. Big step up for me from the original Canon 5D.
NIKON D60085.0 mm f/1.8 lens85mmf/2.81/100s1100 ISO0.0 EV
If you have the money to invest in good glass and can afford to go FX right off the back then yes, I see no reason it wouldn't be a better option versus the D7000 or D5100. The D600 simply opens up more scenarios where you can shoot and achieve the image you're trying for.