<p>Dear Friends;<br /> I am considering a wide angle around 20mm for my 5DMark3. As a former Nikon user, if there was one piece of my kit that I will never forget on performance basis, it would be my Nikon 20mm f/2,8. With it is bargain price and exceptional over all performance, it was like a dream using it on my F6. Even my friend of mine, -who has been motivated with the performance of the Nikon's 20mm-, decided to have Canon version, 20mm EF f/2,8 for his Canon body. But unfortunately he was bitterly regreted for his decision when he has seen the huge performance between the two.<br /> So as a current 24-70 f/2,8 owner I need something wide, and I am now at the same crossroad for the same decision. I feel the lack of the joy of an ultrwide in my photographic life and want to invest on something on similar. So what would be the decision. A newcomer Sigma 20 f/1,4 DG HSM ART lens, one of the new 16-35s(mk2 or f/4 IS version)? To tell you the truth I am always suspicious about the performance of the zoom lenses versus primes. I always used to try the "edges" of the wide angle photography to add an exceptional emotion for my photographic work.<br /> Your comments are welcomed. Would be greatful if you spend little time to see my portfolio to see my wide angle work for further guidance about your thoughts.<br /> Thanks in advance for your comments and your time.<br /> Cheers,<br /> Hakan Karademir</p>