ok - I got the Magazin and read it! Here are the results:
comfort: Panamera is more comfortable as the BMW. Suspension is softer and same time more sportier. They say its amazing how this works
engine: Panamera S PDK, not strong enough, seems to hassle with the weight. The BMW feels lighter and more powerful! They say in case of Pana the Turbo should be the car of the choice
handling: Pana feels amazingly steerable. Only a 911 can do this better.
Space: Pana feels wide, but BMW more spacious. From the trunk, the Pana has the better system, as seats are foldable. Rear seats are on both very good
View: Better in BMW, Pana hard to see and feel where car starts and ends
Summary: The Pana is a great car, feels like a sports car and brings comfort of a Limousine. Final note: The BMW is a great car, but not an Porsche.