I'm not even an advocate for the sculpt being too small (the head looks great on the DX Batman, like a posted a couple of pages ago). On the new body it looks too small though, and I agree with you that it's partly because the body is too big. However, that doesn't mean that the head is perfectly sized.
What I posted is just an observation I've made over the years. It's the same with long necks. On a nude body a neck can look too long, but after layers of clothes it looks perfect, since that's the right context it should be viewed in.