Bernard,
I am currently evaluating and reviewing the D600. I am an editor for a photography trade publication and write for a couple of others so the camera is on loan. Along with being a full time working commercial and advertising photographer (most of my work is B2B oriented , not consumer ads) I review cameras and lenses, lighting and other related hardware and products with a specific bias in mind: As a working professional would trust this instrument enough to use it regularly for my business?
For the record most of the cameras I own are Canon products (1D Mark III, Mark IV, 1Ds Mark III & 1D X bodies) but I do not let that bias me.