Please calm down. Everyone else seems to get the fact that we are comparing one dual-layered DVD to two single-layered DVD's (which would have more space overall.) Therefore, the overall bitspace for both transfers is very similar. The only advantage to the dual-layer is having the entire film on one disc without compromising quality or neccesitating disc swaps.
You keep comparing one dual-layered DVD to one single-layered DVD, and that isn't what the rest of us are talking about.