To be honest (and this might not be popular), but having seen TDK on Saturday in Brussels, I have to say that though I thought Heath was good in TDK, overall the film wasn't spectacular, and though I think Heath probably played the best part in the film (and there were some nice little touches from Heath and a couple of almost Ennis-esque facial expressions, and I think on some level he had some fun playing that part), I don't think it was a particularly Oscar-worthy performance. Interesting certainly, and thought-provoking in parts, but not on the same level as Ennis.
I think Heath's role raised to the film from mere "popcorn" to "popcorn with some style", and certainly none of the other characters stood out, but I don't think that the part he played was spectacular, and certainly not on a par with his performance as Ennis.
Heath, Jake, Michelle, and BBM should have got the award when they had the opportunity, but Oscars for TDK? If they award Oscars for TDK it will prove (which we know anyway) that the whole thing's driven by money and the whole Hollywood commodification and commercialization, and it really would be a travesty to reward commercial success over talent and truly inspiring performances.