That's not an accurate comparison, mixing a v-8 with a v12 makes no sense. Even though they have the same displacement, the v-12 has two extra lever arms on the crankshaft, this will always give a v12 a torque advantage over the v8. That's another reason why the v-12 makes more torque in the lower rpm range. Sorry but can't mix apple and oranges.

Obliviously the turbo has little parasitic drag on the engine as compared to a supercharger, so there is a lot to be gained from turbos, but I'm still on the fence when it come to reliability of a turbo vs S/C engine.