Great stones. The 1000 grit cuts fast and leaves a dull, satin finish. The 1200 grit cuts slower (9 microns versus 15 if they're anything like the US mesh system), but leaves a finish similar to a 1200 grit diamond only with much more forgiveness. The 4000 grit cuts slowly, but leaves a better finish than the 6000 grit stone (looks like the mirror finish of a Norton 8000 grit waterstone, but takes longer). The 8000 grit cuts fast and leaves a great finish. Both the 4000 and 8000 grit Kings (or any other 4k or 8k stone) can be used with a nagura stone to generate a sharpening-friendly slurry. The same nagura can also flatten both stones. It's good like that.
Reflattened my ZDP-189 Delica with the trusty D8XX and polished its relief grind with the 1200, 4000, and 8000 (from whence my opinions are drawn) and set the edge with the 1000, 4000, and 8000. Felt no overwhelming desire to strop the edge after finishing with the 8000 and nothing I cut scolded me for it with high levels of resisting force.