I'm gonna go with Johnson on this one. Superb technical fighter and I think he would a very, very close decision, something like 8-7 as radian said but in favour of Johnson. Really is a tough fight to call.
As many here know, I don't like Tunney! I think he's vastly overrated by many. Not to take anything away from Johnson, because it would be a tough scrap for Gene, I'll give Tunney the close nod in this match up, though. (IMHO, of course.)