This question is for all but mainly directed at Hubsand... What is the absolute sharpest an well corrected 15mm lens that can fit on a 1Ds/5D?
Im pretty sure its the Zeiss right?, but im not sure in that more than one 15mm was made by Zeiss wasnt there, or was that contax, im kinda confused on the exotic glass being my only glass ive ever used was L, anyway hope you guys can clear this up for me so i'll finally know the exact model of 15mm that rules.

Leica 15mm - no question! Next up: the Nikon 14-24mm, followed by the Canon 14mm and Zeiss 15mm. The Nikon 15mm is worth a look, too, on a smaller budget.