Hemi heads like RPM or CID to do their thing. Throw another 100 cubic inches at the Hemi heads and they shine. Comparing wedge to Hemi heads is basically comparing station wagon heads to race car heads. And the results are just about what you would expect. In stock form the wedge heads have tons of low end but run out of steam pretty quick. While the race heads loose down low, but then they pull and pull and pull. We've known this for 50+ years.

But the big downsides of expense and various assembly difficulties keep the Hemis down.

And if you start comparing aftermarket heads, the Hemi is even more the King. But still overly expensive and unnecessarily complicated.

That's my two cents, anyway.