From everything I've read, the two DVDs of The Quiet Man are both pretty bad looking. The elements exist to restore the film but no one wants to do so. A blu-ray won't happen until and unless there is a restoration. And right now even The Alamo (which is falling apart) can't get a restoration, so I don't hold out much hope for The Quiet Man.
Speaking of which... according to the gossip columns of the day, Ben Johnson was supposed to have a role in the movie! Can't figure out which character he could have played as I can't see him in The Quiet Man at all. But it didn't happen -- whether it was because of his fall-out with John Ford or because even earlier Ford had realized he wasn't right for the movie, I don't know.