The Mercedes-AMG GT Four Door is what happens when you take a sports car and turn it into a sedan. Mercedes did just that to its AMG GT and the result, this sleek luxury sports sedan with a decidedly coupe roofline, is a pretty sight but also heavy on the wallet with an MSRP that falls between $137,495 and $159,995.

Why is this news? Well, we're only finding out now what the price tag for the car will be, and this allows us to draw some comparisons. For starters, the AMG GT Four Door is more expensive than the base AMG GT Coupe and also the base Porsche Panamera, but both offer less performance for the money.

The AMG GT Four Door seems expensive but things aren't that straightforward

Mercedes-Benz has released the prices for two of the versions of the new Mercedes-AMG GT Four Door, precisely the GT 63 and the GT 63 S. We're still waiting to see the MSRP for the lower-end GT 53 and GT 43 models which share the same 3.0-liter twin-turbocharged inline-six engine. The big difference there is that the GT 53 has a hybrid system that raises power output from 362 horsepower to 429 horsepower.

So, first up, the GT 63. This model comes fitted with the 4.0-liter, twin-turbocharged, engine taken straight from the GT R Coupe. That's why it produces 577 horsepower and 590 pound-feet of torque with a 0 to 62 mph time of under 4 seconds and a top speed of 193 mph. It seems like a lot, yes, more than a standard AMG GT Coupe which starts at merely $113,395. But the base AMG GT only offers 470 horsepower from its twin-turbocharged V-8. You basically have to go with the GT-R to get the same power because, after all, that's where you find the engine you'll get in the GT Four Door. The GT R, however, has an asking price of $157,995, more than $20,000 over that of the sedan. What is more, the AMG GT Four Door 63 S costs just $2,000 more than the GT R and, for that money, you get 630 horsepower - almost 60 horsepower more, in other words.

Meanwhile, in the sedan world, the AMG GT Four will probably be compared to the Panamera. The base model starts at just around $90,000, but that only buys you a punny V-6 that puts out about 330 horsepower. For the really powerful versions, like the 550-horsepower, V-8-powered GTS, you'll have to pay $150,000. That's almost $10,000 less than the GT 63 S, but you also get 80 horsepower less. In the end, if you want a Porsche four-door that tops anything that Mercedes can offer you have to go for the $187,000 Panamera Turbo S-E Hybrid that puts down 680 horsepower.

Then there's Audi's RS7 Sedan that features a 4.0-liter, twin-turbocharged, V-8, just like the Mercedes-AMG GT 63. The Audi has 605 horsepower and 553 pound-feet of torque, all of which reaches the wheels through Audi's Quattro AWD system if you go for the performance version that has a base MSRP of $130,700. The standard version starts at just $113,900 but only has 560 horsepower and 516 pound-feet of torque. Just by looking at the performance figures, then, the Audi RS7 seems like the best deal, being $7,000 cheaper than the GT 63 and offering almost 30 horsepower more. Obviously, when you get to buy such a car, you'll want to check more than just how much power each car makes and, for instance, the Audi doesn't come with the automaker's latest infotainment system while the Merc does. There are many facets to each story!

2019 Mercedes-AMG GT Four-Door Coupe specifications

Further reading

Read our full review on the 2019 Mercedes-AMG GT Four Door

Read our full review on the 2018 Porsche Panamera GTS

Read our full review on the 2018 Audi RS7 Sportback.