A. Personal work w/one FX body: 24mm/85mm f/1.4G "fast-prime" pair.
B. Event coverage w/two FX bodies: 24-70mm/70-200mm f/2.8G "Trinity" pair.
X. [Event coverage w/one FX body: AF-S Nikkor 24-120mm f/4.0G VR.]
A. Fast-prime pair:
I just happen to love these two, specific focal lengths, the 24mm and 85mm. They were my two, most-favorite focal lengths among the four lenses I owned (24mm, 35mm, 50mm, 85mm) when I began taking photo classes in college way back when, using them on "full-frame" film bodies (FM/FE).
I not only like them for their reduced weight and bulk (not to mention, their incredible speed), I mainly like them for the discipline of vision they impart. I'm "forced" to think in 24mm frames. I'm "constrained" to compose using an 85mm field-of-view. I believe this encourages stronger, more effective pre-visualization in my photography. I like the discipline, the "rigidness." These "borders" define a specific "space" within which I must create.
These days, the 24mm/85mm pair are pretty much the only two lenses I use with my FX body for personal work. I did a paid portrait session a couple months ago, and the only lens I took out of my bag was the 85mm f/1.4G. In fact, I only have three lenses in my bag when I go out shooting for myself, the AF-S 50mm f/1.4G, being the third.
Plus, Nikon had never produced a 24mm f/1.4 lens before. This was literally a brand-new, potential vision for me. Never before had I been able to shoot that wide, with such little light, or such shallow depth-of-field. In addition, with the speed of these two primes, I can shoot damn-near anywhere, under virtually any lighting conditions. These were really my two dream lenses, and although they cost a small fortune, I just had to get them. The only thing better would be if they both had VR.
B. "Trinity" pair and option 'X':
This is the requisite lens-pair for shooting events (assuming you have two FX bodies to go with them). Although I prefer primes, zooms are a necessary evil when your position is restricted (most events I shoot are restricted). The standard de rigueur for events is the 24-70mm/70-200mm pair, but I only own one FX body (and don't own a 24-70mm), so I'm planning to use the AF-S Nikkor 24-120mm f/4.0 VR for event coverage instead. Buying a second D3s, plus a 24-70mm f/2.8G is simply beyond what I can justify at this point.
To conclude, if you just love shooting primes, often shoot in ultra-low light, and don't have to accommodate assignments where you either need further reach, or are restricted in your shooting position, get the primes. If you're shooting events for paid gigs, get the zooms.