The panamera is a much more track-focused (and expensive) car so it's not surprising it's faster around a track. The M5 is the same as an M5 always has been, big fast sedan that doesn't embarass itself on a racetrack. Something is always faster, and for most of its life since the mid '80's the M5 hasn't been the fastest 4-door around a racetrack. That's not the point.
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