Some D600 + 24-70 f2.8 pictures. Is that IQ expected?

You've basically taken a badly detuned guitar connected too an amp turned up to high and struck the strings several times with your hand, then asked us to tell you if the guitar and amp are any good.

The only thing a poorly-framed, over-exposed image shot in daylight at ISO 6400 reveals is the limitations of the photographer, not the quality of the equipment he uses.