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

The shots appears to be as sharp as you can expect considering the settings you used.

If you want to evaluate your lenses then you should pick subjects and conditions that allow you to shoot at base ISO with varying apertures and focal lengths. Just shooting away without paying attention to your settings will not tell you anything, it will in fact only muddle things up.

Unless something is really broken you should get good results with the combo you're using, you have some of the best body/lens combinations in your hand - learn to use it well.

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Jacques
Apple & Eve website and blog : apple-and-eve.com