Miyabi Kaizen vs Shun Classic: Two Ways Into Japanese Steel
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Miyabi’s Kaizen line uses a powdered “micro-carbide” steel core running around 63 HRC — meaningfully harder than Shun Classic’s VG-MAX — which translates into longer edge retention and a finer possible edge. The trade is a slightly more careful hand needed at the stones and, for some owners, a touch more brittleness under hard use. If edge retention is your priority and you’re comfortable sharpening a harder steel, Miyabi Kaizen is the better knife on paper. If you want a slightly more forgiving edge and Shun’s especially comfortable handle, the Classic remains an excellent choice at a similar price.
Both knives are pitched at roughly the same buyer — someone stepping up from a mid-tier Japanese knife into something more premium — which makes the actual steel difference the whole story here.
A genuinely harder core steel
Miyabi’s Kaizen series is built around a powder-metallurgy “micro-carbide” steel core, similar in spirit to the SG2/R2 steels used elsewhere in the premium Japanese knife world, run at roughly 63 HRC. That’s a real step up from the VG-MAX core in Shun’s Classic line, which sits closer to the low-to-mid 60s depending on the batch (and, as independent testing has shown, sometimes considerably softer than the stated figure). The finer, more evenly distributed carbide structure in Miyabi’s steel is what allows it to hold a working edge longer between sharpenings.
Both knives wrap their core in Damascus-style cladding that’s cosmetic rather than functional — the layered pattern looks different between the two brands, but neither one’s cladding reaches the actual edge or changes how the knife cuts.
At a glance
| Spec | Miyabi Kaizen | Shun Classic |
|---|---|---|
| Core steel | Powder “micro-carbide,” ~63 HRC | VG-MAX, claimed 60.5 HRC (tested lower in some samples) |
| Edge retention | Longer | Good |
| Ease of sharpening | Takes a bit more care | Slightly more forgiving |
| Handle | Pakkawood, D-shaped | PakkaWood, especially well-reviewed comfort |
| Cladding | Damascus (cosmetic) | Damascus (cosmetic) |
| Price tier | Premium | Premium — similar range |
What harder steel costs you at the stones
A 63 HRC powdered steel takes more passes on a whetstone than a VG-MAX blade in the low-to-mid 60s, and it rewards a bit more patience and consistent technique — rushing it or using too coarse a stone for too long can leave a rougher finish than you’d get on a softer knife in the same amount of time. It’s not a difficult steel to sharpen by any means, but it’s a small step up in what it asks of you compared to Shun’s core.
The handle question again
Shun’s Classic handle remains one of the most consistently praised in this price bracket for its rounded, comfortable shape across a wide range of grips. Miyabi’s Kaizen handle is well-regarded too, but it doesn’t have quite the same universal reputation — some owners find it excellent, others find it a touch less refined than Shun’s. If handle feel matters as much to you as steel performance, it’s worth handling both before deciding.
Who should buy which
Buy the Miyabi Kaizen if edge retention is your main priority and you’re comfortable putting in a little more care at the sharpening stones for it. Buy the Shun Classic if you want an excellent, slightly more forgiving edge paired with one of the most comfortable handles in this price range.
Frequently asked questions
Is Miyabi Kaizen better than Shun Classic?
For edge retention, its harder powdered steel gives it a real advantage. Shun’s Classic remains competitive on ease of sharpening and handle comfort — “better” depends on which of those you weight more.
Is Miyabi Kaizen harder to sharpen than Shun Classic?
Slightly — its higher hardness takes a few more stone passes and a bit more care to sharpen well, though it’s still very manageable for a home sharpener.
Do both knives use functional Damascus cladding?
No — in both cases, the layered pattern is cosmetic and doesn’t reach the actual cutting edge or affect performance.
Steel and Strop tests and compares kitchen knives and sharpening gear. Hardness figures reflect manufacturer specifications for each core steel.
