I often come across very strong opinions when it comes to serrated versus plain edges. More often than not, users dismiss serrations outright—too ugly, too difficult to sharpen, ultimately useless, impossible to tune… usually without ever having truly put them to the test.

Consider this a brief attempt to set the record straight.

The Spydie UKPK Salt in Magnacut, here in its serrated form, is built for unforgiving environments : lightweight, corrosion-proof, and relentlessly efficient when conditions turn wet, fibrous, or hostile.

Facing it, the Spyderco UKPK Sprint Run in SPY27 with a plain edge embodies precision and control, offering a refined, razor-like cutting experience with effortless maintenance.

What do we got ? Two identical platforms, two radically different philosophies: one designed to endure, the other to excel.

Let’s first compare the steel. Two of my favorite high end alloys and luxury, in this case, does not come from polish or presentation. It comes from intent.

The UKPK Salt, dressed in serrations and armed with Magnacut, carries the modern obsession with resilience to its logical extreme. This is not a steel that negotiates. It exists in total defiance of the elements: saltwater, humidity, neglect. Where older stainless steels would stain, pit, or surrender their edge, Magnacut remains composed, almost indifferent. Its toughness borders on the improbable for something so corrosion-resistant, and yet it refuses to chase the last degree of razor refinement. Its edge is not delicate—it is enduring. One senses immediately that this is a steel designed not for the enthusiast’s bench, but for the long, indifferent stretch of real use.

Across from it, the Golden Child, blade of SPY27, a Sprint Run which offers a very different kind of luxury. Less demonstrative, more intimate. Designed in-house by Spyderco, COM-SPY27 feels less like a technological statement and more like a tuned instrument. It sharpens with ease, almost eagerly, taking on a ultra fine, ultra precise edge that invites control rather than brute persistence. Where Magnacut stands its ground, SPY27 moves—fluid, responsive, alive under the hand. It does not seek to dominate harsh environments; it refines the experience of cutting within them.

The distinction is subtle but decisive. Magnacut is a wonder steel that reassures. SPY27 is an exclusive steel that seduces.

Now about the edge shape…. Here, inevitably, the steel disappears. What remains is the edge—the only part that truly meets the world.

Like Moses said, “Part the matters for me”…
—oh wait, I meant the waters. 😉

On the Salt, the serrated profile transforms the blade into something almost mechanical in its intent. It does not glide; it engages. Each tooth acts as a point of aggression, catching, pulling, tearing through resistant materials with an efficiency that borders on inevitability. Rope, fibrous plastics, anything damp or uncooperative—these are not challenges but confirmations of purpose.
You need to try it to understand it. Serrations aren’t saws—they’re teeth.
Even as the knife loses its initial sharpness, the serrations continue to function, each peak preserving a fragment of cutting power. It is a system designed to keep working long after refinement has faded.

But there is no illusion here. This is not a refined edge. It does not slice so much as it asserts itself. Precision is sacrificed for continuity of performance. Elegance yields to certainty.

To sharpen it, use the corner of a stone or a triangular rod, and treat it like a chisel-ground blade: work each serration individually, then simply remove the burr on the flat side. It’s done in minutes—easy, almost effortless.

The SPY27 Sprint Run, with its plain edge, follows the opposite philosophy. The cut is continuous, uninterrupted—a single line of intent from heel to tip. It can be tuned at will, from a coarse, aggressive bite to a razor’s whisper. There is no tearing, no hesitation. Materials part cleanly, almost silently, as if persuaded rather than forced. In wood, the blade tracks with uncanny precision; in food, it glides effortlessly; in finer tasks, it answers the slightest pressure. Here, SPY27 reveals its true nature—not through endurance, but through absolute fidelity to the cut.

And when the edge begins to soften, it does not resist restoration. A few passes on leather, a moment of attention, and the blade returns to form. There is a rhythm to it—a dialogue between user and steel that serrations, by their nature, cannot offer.

Placed side by side, these two UKPKs do not compete so much as they define a spectrum.

The Salt, in Magnacut and serrations, is a study in persistence. It is the knife that continues when conditions deteriorate, when maintenance is forgotten, when the environment becomes hostile. It asks little and gives consistency in return.

The SPY27 Sprint Run is something else entirely. It is not concerned with surviving neglect. It assumes presence, attention, a certain appreciation for the act itself. It rewards that attention with a level of precision and tactile satisfaction that borders on indulgence.

In the end, the choice is not between better or worse. It is between two forms of excellence.

One refuses to fail.
The other refuses to compromise.

And that review was also inspired (in the background) by that beautiful New Model Army song :

“We all get what we’ve got coming to us
The tide flows both ways across the seas
All following through on promises made
The roads are filled with fleeing slaves and refugees – singing

Part the waters for me

Now this motioning forward will never stop
We’re like sharks in the water, if we stop swimming we die
All coming out of the ruins bedraggled and worn
Like a people who stared too long, too long at the sun in the sky – singing

Part the waters for me

Any god will surely come, deliverance will surely come
On our knees by the stony shore, crack the sky and deliverance will come

Part the waters for me”