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Yes, if your serious about having a Nikon, you should have the F2.8 trinity.
14-24mm, 24-70mm, 70-200mm F2.8.
I just covered a public speaking engagement tonight and the 24-70 was 90 % of the shots, the others were of the podium using the 70-200mm.
I then swapped out the 24-70 with the 14-24 and shot the entire meeting room showing the participants. Without all three, I would have missed either of these shots.
Yep, this is the work group. With a the 2x doubler (whatever it is called.) Although you can crop the heck out of D800 files and still have a great shot if you account for it in the original exposure with enough ISO and shutter speed.
BUT... These are PJ lenses, for when you have to move fast, can't spend a lot of time in PP to edit and so on. If I'm doing portraits it's either the 50 or the 85 and it might be on the camera the whole time. So it depends on your need for speed. You pay a huge premium for the flexibility of the pro zooms.