Currently I either take the D500 with the 1.8/20G or the X100T. Both are similar in many aspects but both inspire different ways to show stuff. cannot really explain. Result is more emotional shots with the X100T. If I want to do street photography, the D600 & 1.4/105E is my friend, waiting for the coming "FX-Version of the D500" to replace the D600. Rarely I take the D3 out. The 1.8/85G is the perfect fit here. Summing up: I rarely carry more than one camera and one lens when I am not on duty. Professionally I take with me everything I need to get the job done plus backup, so three bodies and at least 4 lenses. No zoom in my bag.
Reading the old answer nothing has changes much. The D850 replaced the D3 and the D600 and I still love the D500 & X100T. Usually I take one camera / one lens.
Curretly the D850 with 1.4/58G is a favourite (difficult, but rewarding) or the D500 with the 1.8/85G (a dream team) or the X100T (great IQ very low weight & size). For my garden project I prefer the D850 with the 300PF on Dr-Lens-Extension of 23mm (converted converter).