Imurg
The Grinder Of Pars (Semi Crocked)
The lofts on the Amp are two degrees stronger than the Ping i20. As a result, they will be nearly a club longer through the set, so you should really be comparing the Amp 7i to the Ping 6i for a true comparison.
The Amp has a some what scary 44 degree PW.
The problem these days is that the heads are designed to launch high so the have to crank the lofts down to keep the ball from hitting your nose.
There probably won't be a huge difference in distance if the shafts are the same.