I think Cleopatra - Burton and Taylor and Harrison and co. - comes closer than anything else I've seen. That was pretty much the consensus of a friend of mine who taught a Cleopatra course this past spring too. Comparing what all is out there of course, not what might ideally be created. There's a lot of "grittyness" and detail that shows like Rome get across though that those older movies don't convey, and there's realism in that of course too. A sort of combination to the detail and "commonness" of HBO's Rome's sets and character portrayal and the sets, casting, grandeur of the Cleopatra, with the attention (more than just nominal at least) to historical detail of both would be something really awesome to behold imho.