Sith Sith
Ragnos takes Luke or at least heavily stalls him.
Sadow takes Yoda, no questions about that
Revan takes Dooku easily
Exar takes Exile just as easy.
After that Revan and Exar help the other two Sith against their opponents. Really this thread is a huge overkill. Four of the arguably most powerful Sith/Force users ever against only two great Jedi and two good one's.
Sith Overkill....again
Luke and Yoda are the only ones who would be able to do anything. Light Side Dooku and the Exile are probably about the same, theyed stay alive for a bit, but would be overcome relatively easily. then its four on two, yoda and Luke can't handle that. It doesn't matter who fights who, the Sith win.