Just a single model year after the new Jaguar XF hit the streets, considerable powertrain improvements have found their way under its shapely hood. The previous 4.2-liter V-8 has disappeared from all but the base XF Luxury model, and the main mill has grown to 5.0 liters, gaining both horsepower and torque in its supercharged and naturally aspirated applications. Beyond uprating the engines, Jag added the snarly XFR to the mix, creating a sort of intramodel rivalry and relegating the once top-cat XF Supercharged to middle-child status. How does it stack up now?

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