New Alfa Romeo Giulia Quadrifoglio vs new Mercedes-AMG C63 S: verdict

Both of these high performance saloons produce more than 500bhp, and both have recently been updated. Let's see which is the better buy...

Alfa Romeo Giulia Quadrifoglio vs Mercedes-AMG C63 S rear

Our verdict

The Giulia Quadrifoglio is a fine performance saloon. You’ll appreciate its more cosseting ride and quieter cruising manners, if not its patchy interior quality and prodigious thirst. Plus, it’s great fun on a winding road.

However, it has to take second place here. The C63 is a much better car than it was when we last tested it, hardwiring you into the road surface to give a truly thrilling and engaging driving experience without being so firm-riding as to be uncomfortable.

Granted, it’s quite a bit more expensive to buy and run than the Giulia, but factor in its classier interior, bigger boot and superior infotainment system and the C63 is worth the additional cost.

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1st – Mercedes-AMG C63 S

Mercedes-AMG C63 S front

For Involving and agile handling; V8 engine always sounds great; classier interior
Against Costlier to buy and run; noisier at motorway speeds; pricey options packs
Recommended options Metallic paint (£685)

Alfa Romeo Giulia Quadrifoglio front

For Supple ride; even stronger acceleration; roomier rear seats; better resale values
Against Thirstier; doesn’t put its power down as well; interior feels cheap in places
Recommended options Metallic paint (£695)

Read our full Alfa Romeo Giulia Quadrifoglio review >>

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Specifications: Alfa Romeo Giulia Quadrifoglio

Alfa Romeo Giulia Quadrifoglio badge

List price £67,195
Target Price £65,258
Engine 6cyl, 2891cc, twin-turbo, petrol
Peak power 503bhp at 5400rpm
Peak torque 443Ib ft at 2500rpm
Gearbox 8-spd automatic
0-60mph 3.7sec
Top speed 191mph
30-70mph 2.7sec
30-0mph 7.9m
70-0mph 41.7m
Noise at 30mph 61.7dB
Noise at 70mph 67.5dB
Official economy 27.4mpg
Test economy 23.7mpg
CO2 emissions 235g/km

Specifications: Mercedes-AMG C63 S

Mercedes-AMG C63 S badge

List price £76,903
Target Price £72,448
Engine 8cyl, 3982cc, twin-turbo, petrol
Peak power 503bhp at 5500rpm
Peak torque 516Ib ft at 1750rpm
Gearbox 9-spd automatic
0-60mph 4.1sec
Top speed 180mph
30-70mph 3.0sec
30-0mph 8.5m
70-0mph 45.0m
Noise at 30mph 63.9dB
Noise at 70mph 68.9dB
Official economy 26.2mpg
Test economy 25.5mpg
CO2 emissions 245g/km

Cars pictured

Alfa Romeo Giulia Quadrifoglio with Misano Blue metallic paint (£695) and Harmon Kardon Sound Theatre system (£950)

Mercedes-AMG C63 S with Obsidian Black metallic paint (£685), AMG Premium Plus Pack (£3114) and 19in cross-spoke alloy wheels (£1735)