Samyang/Rokinon/Bower/Pro Optics- Same lens different brands. At about $325, this beauty out resolves the legendary Nikon 14-24mm f/2.8 at what hardly qualifies as a fraction of its cost. At 27 P-Mpix on the Sony A7r or Nikon D810 there's loads of detail to push around in photoshop. Though it has severe mustache distortion, this is very easily fixed with PT Lens or DxO Viewpoint II. Resolution corner-to-corner (that matches your camera sensor) is what matters most in a lens like this as that cannot be remedied in post-production.