We’d hoped for an upset when we decided to pit the Mercedes E63 S and Audi RS7 against the Nissan GT-R . Maybe, we thought, a supersaloon will finally have the measure of the Nissan GT-R. If you’ve watched the film already, you’ll know it was a close run thing, but this time round the GT-R managed to hold its head high (you might remember it was a different story when we pitched it against the Audi R8 V10 Plus, McLaren 570S and Porsche 911 Turbo S). In essence there are a lot of commonalities between these cars. All are 4WD, feature twin turbos and heavy kerbweights. If we’d bothered to work out the stats before we would probably have predicted the right result. Although we think of the Nissan as a weighty coupe, at 1,752kg, it’s still the best part of 200kg lighter than the 1,955kg Mercedes and 1,930kg Audi. So it’s 321bhp/tonne power-to-weight ratio gives it the edge over the Merc (308bhp/tonne) and Audi (309bhp/tonne). Look at the torque figures and it’s a diff...