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I am currently using a Nikon 24-70mm f/2.8 with my D800 and very happy with the quality the lens produces, except the weight (I can live with it at the moment) and the edge softness at 24mm end (at 100%). I've been contemplating to get perhaps a secondhand 24mm f/2.8 AFD. However Ken Rockwell's comment 'It (24mm f/2.8 AFD is as sharp as the 24-70mm f2.8 AFS at 24mm' stops me from going ahead as I don't want waste if it is the case. I would like to hear 1st hand in real world experience from you who use/used both lenses. I don't want to purchase a 24mm f/1.4 because of its price. Of course the softness at 100% viewing (24-70 at 24mm) is not noticeable when you view the image at print size. I would like to ask printing experts amongst you from which print size this edge softness (at 24mm of 24-70mm) becomes an issue? I don't print any images myself but previously I used a pro lab for all my prints. Recently I started upload my images to FAA, and with the files from D800, it says it can print unto 72 inches (longest side) which must be at approx @100dpi. I know the viewing distance increases as the print size gets bigger, but is it really good to offer this size (let's assume image IQ is good)? The late Bruce Fraser once said 'In the case of photogs, the ideal viewing distance limited only by the length of the photog's nose.' But I think to some extent it applies to general public too when they view prints. Thanks Sung