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If it helps I use a 17-40 f4, 35 f2.0 IS, sigma 50 f1.4, 100 f2.8 IS macro, and 70-200 f2.8 IS. I shoot mostly portraits, events, and street but I also work a little in landscape, surreal, macro, wedding, architecture, and travel.
If you like those lenses, maybe you should get the Nikon 'equivalent'. 16-35 f/4, 35 f/2, Sigma 50 1.4, 105VR and 70-200 2.8 VR. These will all work fine with a Df.