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Mueller 4-Stage vs Longzon 4-Stage Sharpener Side-by-Side Comparison

Despite the resemblance they bear to each other, the Mueller and the Longzon actually have very different sharpening styles.

By , , and ·Updated

Mueller 4-Stage

Longzon 4-stage

Mueller 4-Stage vs Longzon 4-Stage Sharpener: Identical Looks, Different Sharpening Results

Overall Verdict

Ranking by
OverallScore Performance50% Design15% Ease of Use35% ScoreOverall 50%Performance 15%Design 35%Ease of Use Mueller 4-StageLongzon 4-stage7.66.79.18.27.05.69.18.2
Showing: 2/2 Items

Apart from their logos, the Mueller 4-stage and the Longzon 4-stage sharpeners look identical. They have a robust build and sturdy construction. Both feature three sharpening slots for kitchen knives and one for scissors. Both sharpeners suffer slightly from a high center of gravity.

When put through the test of sharpening, interestingly, the sharpeners garnered very different results. The Mueller compromised the knife’s edge for quick sharpness, while the Longzon prioritized a smooth, shiny edge over sharpening time and serviceability. 

In the world of ‘convenience’ manual sharpeners, the one that makes the knife cut first has an edge, so the Mueller seems to be the more practical choice.

Pros & Cons

  • Strong construction, pretty coloring
  • Quick sharpening
  • Scissor slot
  • Ease of use
  • Sleek design
  • Substantial, accommodative size
  • Fine, smooth knife edge
  • Inclusion of protective gloves
  • Slot for scissors
  • High center of gravity
  • Harsh on the knife edge
  • Tall base
  • Slow sharpening
  • Ineffective slot layout

Key Specs

Stages
3
3
Scissor sharpener
Yes
Yes
Abrasives
Diamond, tungsten carbide, ceramic
Diamond, tungsten carbide, ceramic
Grit size
Coarse, Medium, Fine
Coarse, Medium, Fine
Dimensions
L9.3 x W1.8 x H3.1 inches
L9.3 x W1.8 x H3.1 inches

Where to Buy

Price at publication
$12.35
$13.30

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Analysis and Test Results

Performance

Overall Performance Scoring
6.7
5.6

Sharpening Time to Cut a Lemon

8.8
1.0
Sharpening Time
1 minute 15 seconds
3 minutes 10 seconds
Cutting Feel
Swift and smooth
Swift and smooth

Material Retention

5.0
9.0
Metal sharpening residue in a bowl
Metal sharpening residue in a bowl
Medal dust on the abrasive slots of the Mueller steel knife sharpener
Metal residue in the sharpening slots of the Longzon knife sharpener
Metal residue in the sharpening slots of the Longzon knife sharpener
The Longzon household knife sharpener next to a bowl containing metal dust residue
Sharpening Time
1 minute
1 minute

Maximum Sharpness Achieved

8.0
6.0
Sharpening Time
6 minutes
6 minutes
Sharpness Level
8 (Chicken breast with skin, 1 swipe)
7 (ripe tomatoes)

Edge Smoothness

4.0
9.0
Close up view in vignette of the knife blade and knife edge after sharpening with the Mueller knife sharpener
Longzon Knife Sharpener Edge Smoothness

Design

Overall Design Scoring
9.1
9.1

In the Box

The Mueller 4-stage knife sharpener lying next to its package box, user guide, and promotion leaflets
The Longzon knife sharpener lying next to its package box, instruction leaflet, and two gloves

Dimensions

The Mueller handheld sharpener with arrows and figures showing its dimensions.
The Longzon household sharpener with arrows and figures showing its dimensions.
Length
9.3" (23.6 cm)
9.3" (23.6 cm)
Width
1.8" (4.6 cm)
1.8" (4.6 cm)
Height
3.1" (7.9 cm)
3.1" (7.9 cm)
Weight
8.6 oz (244 g)
8.7 oz (246 g)

Build Quality

9.1
9.1
The Mueller sharpener standing on a surface
The Longzon sharpener standing on a surface

Working Section

The working section of the Mueller with 4 abrasive slots on a frame and part of its handle and base
The working section of the Mueller with 4 abrasive slots on a frame and part of its handle and base
Top view of the abrasive slots of the Mueller handheld sharpener, with scissor slot, tungsten blades, diamond rods, and ceramic rods
Longzon Knife Sharpener Working Section
Levels of Sharpening
Sharpen (slot 1, 2, 3), Hone (slot 4)
Sharpen, Hone, Polish
Abrasive
Tungsten carbide blades, diamond rods, ceramic rods
Tungsten carbide blades, diamond rods, ceramic rods
Mechanism
Pull through
Pull through
Sharpening Angle
20 degree
20 degrees

Base

The Mueller sharpener lying on a surface with its base in full view
The Longzon sharpener lying on a surface with its base in full view
The Longzon sharpener lying on a surface with its base in full view
Part of the base of the Longzon manual knife sharpener
Material
ABS plastic
ABS
Feet Type
Anti-slip rubber pads
EVA feet

Grip

9.0
9.0
The grip of the Mueller steel knife sharpener and part of its body
Longzon Knife Sharpener Grip
Material
ABS plastic and rubber
ABS, TPR

Usability

Overall Usability Scoring
8.2
8.2

Slot Arrangement

7.0
7.0
The working section on the Mueller handheld sharpener, with 1 slot for scissors and slots 2, 3, 4 for knives
The working section on the Longzon handheld sharpener, with 1 slot for scissors and slots 2, 3, 4 for knives

Insertion

9.0
9.0
Top view of a kitchen knife in one of the Mueller’s abrasive slots, the sharpener being held by one hand
Top view of a kitchen knife being sharpened using the Longzon with 2 hands holding them

Pulling Through

7.5
8.0
2 hands holding and sharpening a kitchen knife with the Mueller sharpener
A kitchen knife being sharpened with the Longzon, and the 2 hands that hold the knife and the sharpener

Stability on a Clean Surface

8.5
8.5
1 hand holding a knife and sharpening it with the Mueller on a countertop, the Mueller held in another hand
A hand holding the Longzon on a kitchen countertop and sharpening a knife with it.

Stability on a Wet and Dirty Surface

8.0
8.0
A kitchen knife being sharpened with the Mueller sharpener on a countertop sprinkled with salt particles
A kitchen knife being sharpened with the Longzon on a countertop with salt particles

Behind the Comparison

Headshot of Anh Ngo
Anh NgoSenior Editorial Director

Anh Ngo is a writer with 9 years experience at different media outlets, covering from public news and events to product testing and analysis. At HealthyKitchen101, she works across different departments, communicating closely with its network of writers, editors, and health, tech, and search engine experts to provide a meaningful and pleasant reading experience for visitors.

Headshot of Lap Vo
Lap VoTest Lead

Lap is Head of the Research, Testing, and Review Team (RTR Team) at HealthyKitchen101.com, where he directs and supervises the testing of kitchen gadgets and appliances.

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Nguyen NtkVisual Specialist

Nguyen Ntk is a graphic designer, photographer, and videographer whose philosophy centers around respecting and celebrating the beauty of reality. Through his lenses, Nguyen strives to capture the true essence of objects and events, showcasing and highlighting authentic features without distortion or exaggeration.

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