Look up "sedan" in a dictionary and you'll find descriptions like 4-seater, 4-door, or simply vehicle with room for four people and luggage. Not a word about sportiness. In 2009, Porsche changed that with the Panamera.Since then, sedans can definitely by sporty -- or, put another way, sports cars can have four doors. The Panamera's second generation aims to do everything even better. The sports sedan has changed not only externally, but also technologically. We took one out on the Lausitzring track to see how well all the innovations mesh.