For FX shooters, literally nothing if we're talking about zooms. The only complaint you'll usually hear from those that have the most recent versions of these three lenses is that the 14-24mm doesn't take filters. That's pretty incredible when you think about it. One missing feature complaint, but no real performance complaints. That said, some FX shooters probably would be better served by primes (or at least mixing in a few primes). The f/2.8 aperture of the lens trinity removes some ability to isolate backgrounds.
DX shooters can't quite match this, but I'd suggest the Tokina 11-16mm or 11-20mm f/2.8, the Sigma 18-35mm f/1.8, and either the Sigma 50-100mm f/1.8 or the Nikkor 70-200mm f/2.8 as a pretty good imitation.
