We get behind the wheel of the Lexus LS 500h, the company's most luxurious sedan. In it's 5th generation, the LS get more power, more technology and well, even a few stars in the looks department. There's a lot that is missing though, however, the LS 500h is likely to give its competitors like the Mercedes-Benz S-Class, BMW 7 Series a run for their money. We drive it to find out more.