Still, there’s not much arguing with the underskin execution. The V6 (appreciably shorter than the straight six in the 5-series) is tucked right back in the chassis, driving the rear wheels, through a seven-speed autobox. On this M37S Premium, the driver also gets the assistance of active four-wheel steer.
Using the three-position switch mounted on the centre console, the driver can dial up three very different characters. The Eco mode delivers a very long travel for the accelerator pedal and actively resists hard acceleration from the driver. A green light on the dash indicates suitably eco progress.
In Sport, however, this car really wants to motor. It’s extremely quick-witted, agile and thrusting, making good use of the motor’s sweet-spinning and pacey nature. The M37 also feels firmly planted and stable at high speeds.
However, if there’s one criticism of the the M37’s Sport setting, it’s one of over-eagerness. It can over-exaggerate the driver’s inputs and, consequently, exaggerates the car’s outputs. When pressing on in the M37, particularly during high-speed overtaking manoeuvres, progress is touch frenetic.
The Standard setting is much less focused than Sport, with the car delivering a less direct response to steering inputs. Indeed, the whole car is much slower-witted in the way it responds to moving away from straight head.
I was impressed by the four-wheel steering in Sport mode. Its response is extremely keen at lower speeds. Travelling around slow-speed corners the M37 really feels like it is centre pivoted.
At higher speeds, the 4WS allows the driver to easily run up to the tyres’ limit of adhesion. Pushing hard through bends, there’s no sense of understeer at all - though the sensations coming back through both the seat and wheel rim are rather distant and mechanical.
The brakes are nicely powerful at their full extent and also easy to modulate under hard braking. The car’s ride was remarkably good, too, especially considering it was rolling on big 20in wheels.
Should I buy one?
The question is whether you should buy one over a 5-serie, but in many ways the M37 is more of a Japanese Jaguar XF than a Beemer and it struggles in this respect.
Where the Jaguar has a masterful maturity under pressure, the Infiniti is just that much more brittle and digital.
Infiniti M37S Premium
Price: £45,665; Top speed: 155mph; 0-62mph: 6.2sec; Economy: 27.7mpg (combined); CO2: 235g/km; Kerb weight: 1765kg; Engine: V6, 3696cc, petrol; Power: 315bhp at 7000rpm; Torque 266lb ft at 5200rpm; Gearbox: 7-spd autoSee all the latest Infiniti reviews, news and video