Precision in communication is a critical skill not all primary schools stress. Say "top-rung Mercedes," and pillowy-soft sedans driven by people in gray suits and matching hats come to mind. Add "AMG" to the previous statement, however, and the image is completely different. In case you've been hiding under a rock for the past few years, you'll recognize that top vision as the Mercedes-AMG GT R, a car that the Affalterbach wing of Mercedes-Benz built to go toe to toe with the best from Porsche. 