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Kia K4 vs Mercedes S-Class comparison

Compare performance (180 HP vs 635 HP), boot space and price (24,800 £ vs 104,000 £ ) at a glance. Find out which car is the better choice for you – Kia K4 or Mercedes S-Class?

Kia K4 vs Mercedes S-Class: Key differences

Kia K4

4.4 (6 Reviews)
rate
  • significantly cheaper
  • clearly lighter
  • moderately more trunk space
details

Mercedes S-Class

  • considerably more power
  • substantially more efficient
  • significantly quicker 0–100 km/h
details

All details on performance, efficiency, range and trunk space can be found in the technical comparison below – including user reviews for both models.

By Achim Sedelmaier

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

K4

Costs and Efficiency:

Looking at overall running costs, both models reveal some interesting differences in everyday economy.

Kia K4 is significantly cheaper – starting at 24,800 £ , while the Mercedes S-Class costs 104,000 £ . That’s a price difference of around 79,257 £.

Fuel consumption also shows a difference: the Mercedes S-Class uses 2.2 L/100km and is substantially more efficient than the Kia K4 with 5.8 L/100km. The difference is about 3.6 L/100km.

S-Class

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 considerably more power – delivering 635 HP compared to 180 HP. That’s roughly 455 HP more horsepower.

When accelerating from 0 to 100 km/h, the Mercedes S-Class is significantly quicker – completing the sprint in 4 s, while the Kia K4 takes 8.4 s. That’s about 4.4 s quicker.

There’s also a difference in torque: the Mercedes S-Class delivers substantially more torque with 850 Nm compared to 265 Nm. That’s about 585 Nm more.

Space and Everyday Use:

Beyond pure performance, interior space and usability matter most in daily life. This is where you see which car is more practical and versatile.

Both vehicles offer seating for 5 people.

In terms of curb weight, Kia K4 is clearly lighter – 1,415 kg compared to 2,165 kg. The difference is around 750 kg.

Looking at boot space, the Kia K4 offers moderately more boot space – 604 L compared to 530 L. That’s a difference of about 74 L.

When it comes to payload, the Mercedes S-Class carries clearly more – 660 kg compared to 455 kg. That’s a difference of about 205 kg.

Who wins the race in the data check?

The Mercedes S-Class is clearly superior overall 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 £104,000
S-Class

Mercedes S-Class

  • Engine Type Petrol MHEV, Plugin Hybrid, Diesel MHEV
  • Transmission Automatic
  • Drive Type All-Wheel Drive, Rear-Wheel Drive
  • Power HP 336 - 635 HP
  • Consumption L/100km 2.2 - 11 L/100km
  • Electric Range 98 - 118 km
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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Kia K4

Kia K4 shakes up the compact-sedan crowd with concept-car looks, a smartly packaged cabin, and the kind of easygoing refinement that makes rush hour feel less like a chore. It blends value, tech, and a dash of attitude, serving up a smooth, confident drive that might have you taking the long way home just to show off those angles.

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Reviews Kia K4

4.4 (6 Reviews)
rate
Joz
20 May 2026, 08:04:45

A modern, ultra-easy-to-use car with a full set of systems and assistants that work as they should, but with a sluggish gearbox and poor noise insulation.

Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money
Joz
20 May 2026, 08:04:45

A modern, ultra-easy-to-use car with a full set of systems and assistants that work as they should, but with a sluggish gearbox and poor soundproofing.

Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money
Joz
20 May 2026, 08:04:44

A modern, ultra-easy-to-use car with a full set of systems and assistants that work as they should, but with a sluggish gearbox and poor noise insulation.

Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money
Joz
20 May 2026, 08:04:44

A modern, ultra-easy-to-use car with a full set of systems and assistants that work as they should, but with a sluggish gearbox and poor sound insulation.

Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money
Joz
20 May 2026, 08:04:44

A modern, ultra-easy-to-use car with a full set of systems and assistants that work as they should, but hampered by a sluggish gearbox and poor soundproofing.

Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money

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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21C0613_043

Reviews Mercedes S-Class

No reviews yet. Share your experience and help others decide.

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Kia K4
Mercedes S-Class

Costs and Consumption
Price
24,800 - 34,200 £
Price
104,000 - 201,400 £
Consumption L/100km
5.8 - 7.1 L/100km
Consumption L/100km
2.2 - 11 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
98 - 118 km
Battery Capacity
-
Battery Capacity
-
co2
132 - 161 g/km
co2
50 - 252 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Hatchback, Estate
Body Type
Sedan
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
1,415 - 1,540 kg
Curb weight
2,165 - 2,650 kg
Trunk capacity
328 - 604 L
Trunk capacity
345 - 530 L
Length
-
Length
-
Width
1,850 mm
Width
1,921 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
435 - 455 kg
Payload
420 - 660 kg

Engine and Performance
Engine Type
Petrol, Petrol MHEV
Engine Type
Petrol MHEV, Plugin Hybrid, Diesel MHEV
Transmission
Manuel, Automatic
Transmission
Automatic
Transmission Detail
Manual Gearbox, Dual-Clutch Automatic
Transmission Detail
Automatic Gearbox
Drive Type
Front-Wheel Drive
Drive Type
All-Wheel Drive, Rear-Wheel Drive
Power HP
115 - 180 HP
Power HP
336 - 635 HP
Acceleration 0-100km/h
8.4 - 12.3 s
Acceleration 0-100km/h
4 - 5.7 s
Max Speed
-
Max Speed
-
Torque
200 - 265 Nm
Torque
560 - 850 Nm
Number of Cylinders
3 - 4
Number of Cylinders
6 - 8
Power kW
85 - 132 kW
Power kW
247 - 467 kW
Engine capacity
998 - 1,598 cm3
Engine capacity
2,989 - 3,982 cm3

General
Model Year
2,025 - 2,026
Model Year
2026
CO2 Efficiency Class
D, E, F
CO2 Efficiency Class
G, B, F
Brand
Kia
Brand
Mercedes-Benz
Is the Kia K4 offered with different drivetrains?

The Kia K4 is offered with Front-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.