Mostly applies to drag racing in Top Fuel & Funny Car classes though. The Hemis weren't as domaneering in Pro-Stock and slower classes. The wedge motors (anyone's) tended to have better bottom end and mid range grunt.
Here's something you don't see too often anymore, a Chevy Hemi:
(Block by Chevy, heads & manifolding by Arias)
These were actually very competitive to the Chrysler based Hemis it Top Fuel & Funny Car and are still competitve in off-shore marine racing and tractor pulls.
This Arias/Chevy hemi motor is going into the T-bucket roadster one of my co-workers is building: