Mercedes-AMG GLC63 vs MG S6 EV

What's the difference?

It doesn't feel like that long ago I spent a day with the brand spanking new Mercedes-AMG GLC 63 S when it first arrived in Australia. It's a car that stuck with me, the SpaceX-worthy thrust of AMG's 4.0-litre twin-turbo V8 translating into that dirty V8 exhaust note.

Turns out it wasn't that long ago, but time waits for no car - the 2020 GLC 63 S has arrived, with some useful upgrades and a deep suspicion that someone, somewhere thought the car needed some changes.

And they may be right, because in June 2018, the GLC 63 S assumed an empty throne. Now in 2020, it has the Jaguar F-Pace SVR and BMW X3 and X4 M twins to deal with.

So, under a scorching hot Bathurst sun, I examined the box-fresh GLC 63 S for signs of nefarious activity, hoping things have not changed for the worse just because there are a couple of challengers in town.

BYD, Chery, GWM and MG - one of these Chinese car brands is not like the others.

While the first three all enjoyed major growth in 2025, MG had a year to forget. A flood of new models, rushed into the market with little or no fanfare, resulted in a nearly 20 per cent sales decline, when the brand should have been basking in the same growth as its rivals.

So, the old management has been swept away and MG Australia is attacking 2026 with a fresh outlook and a renewed purpose, fully aware that launching an affordable car and hoping the buyers come is not a sound strategy.

Which is why the brand is making a far more concerted effort with this all-new MGS6 (all one word, likely to avoid copyright issues with Audi). It’s an important model to get right, too, as the electric mid-size SUV is becoming an increasingly popular choice for Australian buyers, as witnessed by the success of the BYD Sealion 7 and Tesla Model Y.

But with those two, plus many more mid-size EV SUVs, including the Kia EV5, GAC Aion V, Geely EX5 and Zeekr 7X (to name a few), to compete with, MG will need to put its best foot forward to give the MGS6 its best chance of success.

This one model alone won’t determine the fortunes of MG in the final reckoning of the year, but if MG wants to turn around its sales numbers and enjoy the same growth as its Chinese rivals, having the MGS6 succeed would be an important step.