The Signature model is the range-topping Mazda 6 with the best cabin materials and the most advanced safety gear. The Nappa leather seats enhance an already superb interior, and Mazda includes a lovely seven-inch LCD in the instrument cluster. Daily life is made easier thanks to parking sensors at the front and rear, as well as a surround-view camera system. Finally, the Signature adds traffic sign recognition to an already impressive host of driver-assistance features. Sen Wood and Ultrasuede trim inserts in the cabin elevate the sensation of luxury.