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I've heard that it is very hard to manually focus fast lenses on digital cameras, is it possible to use the stop down button on the camera and focus at the taking aperture. You could always open it up all the way after focusing.
with super fast lenses it's much better to focus at shooting aperture because most of them have some focus shift. also, at f/1.2 or similar dof is extremely narrow, if you focus stopped down than open up the lens you will have a much narrower dof than you did when you focused. in my experience focusing fast lenses on dslrs is only really a problem with nikon cameras because nikon doesn't offer precision matte focus screens while canon and sony do. these are screens optimized for focusing fast lenses while the stock screens that come with modern dslrs are optimized for brightness when using slow zooms. magnified liveview is definitely the easiest way to focus superfast lenses btw.
on an unrelated note, here is a shot with the rokkor 58/1.2 on a NEX: