You didn't get ripped off but you didn't buy it at a sale price either. It was a decent buy.
About the notebook your friend has, that's the fastest Mobile GPU AMD has to offer. Value wise it's not worth it and you are paying quite the premium for it. In addition to that, you really can't game for any period of time without plugging it in. The battery doesn't last long enough. That's the problem with these high end laptops, they increase the power draw with the GPU but don't compensate battery wise.
The mobile versions are not as fast and the desktop ones, so if you are comparing mobile to desktop, usually you should expect much less performance. Comparing the laptop you have to your friends, you would see about a 45% difference.