The Hellcat starts at 55k (and you can bet there will be dealer markups). It's priced as a top line performance model, so comparing it to the new 2016 SVT model would be more appropriate. No Mustang variant will likely beat it in a straight line consistently, but the hi Po Mustangs will likely wipe the floor with it on anything that involves turns.
The Challenger RT Scat Pack at 38k is an interesting comparison. It has engine upgrades that give it 485 hp. However it still has a massive gap in weight with the GT and will suffer in any competition outside the drag strip.
I think both companies are going different directions. Dodge is sticking to the model of building a powerful, comfortable Boulevard cruiser while Ford is looking to bring the Mustang closer to balanced sports car performance.
One area where Dodge has the edge is the transmissions being offered.
Other than that, I prefer the Ford in every way. Never could buy a Chrysler product.
Current: 2015 Ford Focus SE
Former: 2007 GT, Satin Silver