I was able to actually compare the 10 Mustang, Camaro, and Challenger at the auto show in person. You can see the size/weight difference of the Mustang compared to the monstrous size/weight of the brand Xers. And according to that Motor Trend article the Mustang with only 315hp only lost to the Camaro by .50 sec. that to me is close. And they needed to put 425hp in the Challenger to move it's 4,100lbs. One thing I always do when I compare any motor vehicle is look at the power to weight ratio.
Glad to see my 3,060lb Mustang with 350 to the tires still smokes em all!