I bought a small petty a few months ago. My references are a Takeda gyuto, Shigefusa nakiri, Mizuno cleaver, Masamoto suji that I own (wll carbons) together with a CCK, Sbibazi and a few european knives.
In terms of sharpness it is up there with the big four. I could say that I get better edges with it than the Masamoto. Difficult to say about the rest.
In term of easiness to sharpen, it is the easiest of all. Actually touch ups, even with an Ikea ceramic rod, are a breeze. It gets shaving sharp with just two-three swipes.
Edge retention, I cannot really judge. It doesn't get that much use and I sharpen often. But definitely worse than the Mizuno, Takeda, more or less the same as the Masamoto.
Profile, grind performance. Cannot comment a lot, being a petty I am not asking a lot from it. I did ask for the thin version which is ok, probably not than thin if you are used to things like Takeda.
Fit&Finish. A little bit rough, some sloppy polishing and grind marks here and there around the edge. Nothing serious, after sharpening a few times they have disappeared.
I like a lot how it looks. Gets a wavy patina around the edge that looks nice and goes well with the whole hammered look.
I was not expecting much. My primary objective was a Mizuno cleaver at that purchase, I ordered without any research to take advantage of common shipping. But it certainly delivered more and I expected and I am happy with it. For me it was good value.