All seem to at the least show bleeding in a dark room on a black screen.
I guess it's at least somewhat comforting to know that I'm not the lone ranger with this, but I wonder if it's an issue that can be used to get a replacement?
Yes. Apple will exchange them for that. But every post I've seen on Macrumors from people who have exchanged have all gotten units that still had some bleeding--some where better than the ones they had, some were worse.
So I'd wait it out a bit and see if they do something to really fix the problem since it seems like most every unit has some level of bleeding noticeable on dark screens in dark rooms.
Also, some have suggested that it could be a glue issue and when the glue totally dries it will block the light more fully. Not sure I buy that, but I guess its another reason to wait since you're not likely to exchange and get a perfect unit right now anyway.