long term test review: M5 vs Panamera GTS
http://www.carmagazine.co.uk/Drives/...ong-term-test/ (see his views month 4 and month 9, which appear to have shifted: "Just to keep twisting the knife, let’s throw in a rival too, say the BMW M5, which has 128bhp more power, costs £18k less, and when you drive it hard it’s better than the Panamera – and every other super-saloon on sale.")
http://www.carmagazine.co.uk/Drives/...m-test-review/ (see months 10 and 11)