Does you know if someone has done a comparison between the old and new Vader costumes? I really hate the Vader that has been in use since Episode III, and I'd like to have a closer look at what exactly the changes that irk me so were.

As near as I can tell, the helmet was certainly shortened and possible slightly remodelled. I seem to recall someone defending the choices as being 'to make him look newly minted' and 'the old helmet was never satisfactorily modelled' or something to that effect.