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Mercedes S-Class vs Hyundai IONIQ 9 comparison

Compare performance (635 HP vs 428 HP), boot space and price (104,000 £ vs 59,900 £ ) at a glance. Find out which car is the better choice for you – Mercedes S-Class or Hyundai IONIQ 9?

Mercedes S-Class vs Hyundai IONIQ 9: Key differences

Mercedes S-Class

  • visibly more power
  • clearly quicker 0–100 km/h
  • moderately lighter
  • visibly more trunk space
details

Hyundai IONIQ 9

  • substantially cheaper
  • considerably more electric range
details

By Achim Sedelmaier

Here’s where it gets real: The technical differences in detail

S-Class

Costs and Efficiency:

When it comes to price and running costs, the biggest differences usually appear. This is often where you see which car fits your budget better in the long run.

Hyundai IONIQ 9 is substantially cheaper – starting at 59,900 £ , while the Mercedes S-Class costs 104,000 £ . That’s a price difference of around 44,148 £.

As for electric range, the Hyundai IONIQ 9 offers considerably more range – reaching up to 620 km, about 502 km more than the Mercedes S-Class.

IONIQ 9

Engine and Performance:

Under the bonnet, it becomes clear which model is tuned for sportiness and which one takes the lead when you hit the accelerator.

When it comes to engine power, the Mercedes S-Class offers visibly more power – delivering 635 HP compared to 428 HP. That’s roughly 207 HP more horsepower.

When accelerating from 0 to 100 km/h, the Mercedes S-Class is clearly quicker – completing the sprint in 4 s, while the Hyundai IONIQ 9 takes 5.2 s. That’s about 1.2 s quicker.

There’s also a difference in torque: the Mercedes S-Class delivers a bit more torque with 850 Nm compared to 700 Nm. That’s about 150 Nm more.

S-Class

Space and Everyday Use:

Cabin size, boot volume and payload all play a role in everyday practicality. Here, comfort and flexibility make the difference.

Seats: Hyundai IONIQ 9 offers more seats – 7 vs 5.

In terms of curb weight, Mercedes S-Class is moderately lighter – 2,165 kg compared to 2,594 kg. The difference is around 429 kg.

Looking at boot space, the Mercedes S-Class offers visibly more boot space – 530 L compared to 338 L. That’s a difference of about 192 L.

When it comes to payload, the Mercedes S-Class carries marginally more – 660 kg compared to 643 kg. That’s a difference of about 17 kg.

Who wins the race in the data check?

The Hyundai IONIQ 9 is decisively ahead in the objective data comparison.
This result only shows which model scores more points on paper – not which of the two cars feels right for you.

from £59,900
IONIQ 9

Hyundai IONIQ 9

  • Engine Type Electric
  • Transmission Automatic
  • Drive Type Rear-Wheel Drive, All-Wheel Drive
  • Power HP 218 - 428 HP
  • Consumption kWh/100km 19.9 - 20.6 kWh/100km
  • Electric Range 600 - 620 km
details

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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Mercedes S-Class

The Mercedes S-Class wraps peerless comfort, whisper-quiet luxury and subtle tech wizardry into a chauffeur-ready package that still knows how to engage the driver. It’s the car for buyers who want to arrive relaxed, be taken seriously and occasionally enjoy a grin when the road reminds them this limousine can dance.

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Hyundai IONIQ 9

The Hyundai IONIQ 9 is a bold step forward in the automotive world, combining cutting-edge electric technology with a sleek and modern design. This model stands out with its spacious interior and advanced features, ensuring both comfort and convenience for drivers and passengers alike. As Hyundai pushes the envelope in eco-friendly innovation, the IONIQ 9 represents the future of sustainable driving with its impressive range and performance capabilities.

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Reviews Hyundai IONIQ 9

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Mercedes S-Class
Hyundai IONIQ 9

Costs and Consumption
Price
104,000 - 201,400 £
Price
59,900 - 75,500 £
Consumption L/100km
2.2 - 11 L/100km
Consumption L/100km
-
Consumption kWh/100km
-
Consumption kWh/100km
19.9 - 20.6 kWh/100km
Electric Range
98 - 118 km
Electric Range
600 - 620 km
Battery Capacity
-
Battery Capacity
-
co2
50 - 252 g/km
co2
0 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Sedan
Body Type
SUV
Seats
5
Seats
7
Doors
-
Doors
-
Curb weight
2,165 - 2,650 kg
Curb weight
2,594 - 2,689 kg
Trunk capacity
345 - 530 L
Trunk capacity
338 L
Length
-
Length
-
Width
1,921 mm
Width
1,980 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
420 - 660 kg
Payload
586 - 643 kg

Engine and Performance
Engine Type
Petrol MHEV, Plugin Hybrid, Diesel MHEV
Engine Type
Electric
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Automatic Gearbox
Transmission Detail
Reduction Gearbox
Drive Type
All-Wheel Drive, Rear-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
336 - 635 HP
Power HP
218 - 428 HP
Acceleration 0-100km/h
4 - 5.7 s
Acceleration 0-100km/h
5.2 - 9.4 s
Max Speed
-
Max Speed
-
Torque
560 - 850 Nm
Torque
350 - 700 Nm
Number of Cylinders
6 - 8
Number of Cylinders
-
Power kW
247 - 467 kW
Power kW
160 - 315 kW
Engine capacity
2,989 - 3,982 cm3
Engine capacity
-

General
Model Year
2026
Model Year
2025
CO2 Efficiency Class
G, B, F
CO2 Efficiency Class
A
Brand
Mercedes-Benz
Brand
Hyundai
Is the Mercedes S-Class offered with different drivetrains?

The Mercedes S-Class is offered with All-Wheel Drive or Rear-Wheel Drive.

DriveDuel uses data analysis and artificial intelligence to evaluate vehicle data and create content. Content is regularly reviewed and improved. The displayed prices are estimates based on German list prices, adjusted to the respective country’s VAT. Country-specific registration taxes are not included. This information is not legally binding.