What does he say?
Both are very precise through the slalom. The Merc has a little bit more bodyroll, but is just as fast, which is surprising.
Both have very good optional ceramic brakes.
The Merc needs only 0.3sec more to 100km/h, revvs higher than the turboed Porsche and offers lots of driving pleasure.
The Merc is very comfortable: lots of space, comfortable suspension, despite the optional 19". Its front steel, rear air, but all adjustable suspension system can absorb especially the short bumps considerably better than the all-air Porsche system.
The Porsche gives a sportscar feeling: firm, very supportive seats...
In the end, the Merc wins, not by far but still clearly. It's 30.000€ less expensive while stlightly more all-rounded: more space, more electronic assistance, very easy to drive but lots of power and pleasure.
The Panamera is the sportiest, its all-wheel drive makes it more secure on the limit or when it's rainy.