Most of the photos were taken at f/11. I've done some shots taken at f/2.8 and did not detect any significant fall in image quality across the frame. To be honest, the 14-24mm is the first and only UWA zoom I've used which is so consistent.
Compared to the newer and cheaper 18-35mm f3.5-4.5, does the 14-24mm still triumph in terms of IQ and sharpness?