Much like Jeep, the iconic G-Wagan has evolved over the past 4 decades from a utilitarian, military-spec 4-wheeler to the top rung of Mercedes’ luxurious SUV lineup. And it’s been redesigned this year with a more grandiose personality and of course more earth scorching power. This is the new G 63.Take a heritage, body-on-frame utility vehicle, stuff it with an AMG V8, and dress it up to luxury spec and …