Yeah, but it's not just the 60fps HD that gives MGRR the edge -- I feel MGRR also has the better art. The enemies and bosses look infinitely cooler in Rising, which I guess is also to be expected since it is an action game. In retrospect, the B&B Corp in MGS4 were pretty damn awful.
I think MGS 4 has better art and character models, but that's about it.