Yeah, but the new pixel and processor technologies are narrowing the gap fast, particularly with the new FF dslrs. I haven't stretched my 5D2 beyond 12x18, but those results were so good that I'm thinking of ordering some larger prints for mounting.
Still, if I were paid to shoot for billboards, I'd probably go MF; however, the next generation or two of FF may do the trick for just about anything you'd hang on your wall.
Dave
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