Here's a comparison test between two of the moment's hottest executive super saloons: the Jaguar XFR-S and the Mercedes E63 AMG. Here are a few technical specifications. The XFR-S Jag comes with a supercharged 5.0-liter V8 engine that spits out 550 hp and 680 Nm of torque. With this engine, the British big cat is able to accelerate from zero to 62 mph (100 km/h) in just 4.6 seconds. The German E63 AMG is powered by a larger 5.5-liter biturbo V8 engine, which is good for 557 hp and 720 hp. The Mercedes E63 needs just 4.2 seconds to reach the 62 mph (100 km/h) mark thanks to 5 extra horsepower and its 40 extra Nm of torque. The all-wheel-drive E63 AMG 4MATIC is able to reach 62 mph (100 km/h) in just 3.7 seconds. Even though the E63 can reach 62 mph faster than the XFR-S, it is limited to a top speed of 155 mph (250 km/h). The Jaguar can keep on accelerating until it reaches a maximum speed of 186 mph (300 km/h).
In conclusion, on paper, comparing the Jaguar XFR-S and the Mercedes E63 AMG is quite tricky. Maybe this real life test will help you decide between the two a lot easier.