Get Tamron SP 15-30mm f/2.8 Di VC USD Lens or Nikon 14-24mm f/2.8G at B&H Photo
Tamron 15-30mm vs Nikon 14-24/2.8G (Pescadero Creek, Nikon D810)
Overview of Tamron SP 15-30mm f/2.8 Di VC USD
This comparison turns out to be one of the very best yet for showing the awful focus shift in the Nikon 14-24mm f/2.8G.
It also makes a good demonstration of how image stabilization can damage image sharpness. This comparison won’t answer all the optical questions (some reshooting needed), but I deem it more interesting and thought provoking than most comparisons!
Tamron SP 15-30mm f/2.8 Di VC USD and Nikon 14-24mm f/2.8G ED
f8 @ 1.6 sec, ISO 64; 2015-03-29 18:14:22[low-res image for bot]
NIKON D810 + 15.0-30.0 mm f/2.8