The Shapton HC series come in 4K, 6K and 8K and they're a little different. These stones were developed for carbon steel knives. They polish at an extremely high level but don't cut quite as well as the regular series stones. These stones are ideal for those looking to mirror polish their edges or for sharpening carbon steel straight razors.
This 8K version is extremely nice finisher. It leaves a high luster and under magnification there is only the slightest scratch pattern visible. It basically leaves almost no teeth under 100x magnification.