The all-new BMW 5 Series Touring takes the saloon’s slick styling, updated chassis, modern in-car tech and punchy engines and adds a boatload of extra practicality in the form of a roomier estate rear end. Will this E-Class Estate, Audi A6 Avant and Volvo V90 rival lead the field of does BMW‘s latest effort disappoint? I head to the international launch in Germany to find out.