Sun 09-Sep-12 03:03 PM | edited Sun 09-Sep-12 03:10 PM by KnightPhoto
Then both the 15mm and 21mm Zeiss might be worth your consideration as well as the Samyang 14mm.
I am interested in the just announced 24mm PC from Samyang for architecture!
Re. the 14-24 DigLloyd has documented focus-shift, which is a lens-design issue, not sure if that was a factor in your case (on stopping down focus shifts AWAY from focal point in central area of the frame).