I have a black Ark which I prefer burnished. Some might call it glazed. Super smooth. Perfect for final finishing. It requires a very good pre-finisher before going to this step though.
I have a Dan’s hard Ark. This is not a Norton “hard” and is probably one small step down from a True Hard. Most closely resembles a 5K synth. I have one side lapped to 1200 SiC and the other side to 800 SiC. This is my favorite finishing stone for high quality knives.
I also have a Dan’s washita that I picked up recently. This is IMHO real close to a Soft Ark. I lapped one side to 1200 SiC. It was slow in abrading a quality carbon knife but left a good aggressive edge. On a cheap stainless knife it failed to produce a workable edge. I ended up roughing it up with an 80 grit cheap Chinese diamond plate. After that the surface was about equivalent to finishing on 120 SiC. This produced a very good toothy edge on the cheap knife albeit a little slow. A coarse diamond plate, or synth stone could have done the same job in less time.