Owning a Porsche Panamera Turbo S in Australia is like owning a lion and keeping it permanently locked in a cage.

It’s a powerful and ferocious beast that deserves to roam free; driving it within the stifling confines of Australia’s speed limits, it feels shackled, bored even. A trip to Heathcote Raceway drag strip graphically illustrates the problem.

The Panamera Turbo S takes just 4.41 seconds to pass the national speed limit (110km/h for everyone not in NT), having hit 100 in 3.82. The quarter mile vanishes in 11.82sec at 192.39km/h and extracting this performance couldn’t be easier: simply hit the ‘Sport Plus’ button, press your left foot firmly on the brake, mash the accelerator into the carpet then release the brakes.

Porsche Panamera Turbo S driving

Don’t think that the Panamera Turbo S is a one trick pony, however. On the highway it wafts along silently, air suspension isolating occupants from the road’s undulations, the 4.8-litre twin-turbo V8 dropping to idle on downhill sections as the seven-speed PDK ’box engages its ‘sailing’ mode to save fuel.

Switch to ‘Sport’ and the exhaust bellows like a grizzly with a toothache, the gearbox wakes up and body control tightens without sacrificing the ride. Attack a sequence of corners and you sense that if it could, the Turbo S would simply raise an eyebrow – “is that all you’ve got?”

Porsche Panamera Turbo S driving

At first the Turbo S’s $444,600 ($469,800 as tested) seems absurd; how can it cost twice a (more powerful) BMW M5? While undoubtedly pricey, the Panamera’s composure and feedback elevates it above both the traditional super sedans and price rivals such as the Bentley Continental Flying Spur or Aston Marin Rapide.

What the Panamera lacks is the bespoke feel of the Bentley and Aston. It’s beautifully built, and all the creature comforts are present, but it majors on function rather than flair. Is it reasonable to expect a bit more of a sense of occasion at this price point? Regardless, the Turbo S is an incredible achievement in defying the laws of physics, but if you buy one, just remember to let it out of its cage every now and again.

Specs: Engine 4806cc V8, DOHC, 32v, twin-turbo Power 419kW @ 6000rpm Torque 800Nm @ 2250-4500rpm* Weight 1970kg 0-100km/h 3.8sec Price $444,600 *overboost

4.5 stars