RJ put it well!
I believe that the 6K is a bit too coarse for a good shave. The Norton 8K will do a fair shave. Another hone above that would be useful too!

One thing to watch and ask questions, before buying, about is the size of the hones. We often take for granted that a hone is the usual 2.5" or 3"x 8" or so. The quick money boys sell a lot smaller hone. Not that they are bad, just know what you are buying for a given amount of money. Howsomever, see what is usually suggested here on the forums.

I learned on the King and Ice Bear series and often use one of them for a specific purpose or in pyramid honing. The ones I have are of good quality but I did return one that had flaws.

The King series appears as a bit higher/finer grit than the Norton's for a given designation. That means they may cut slower for a given grit number. Or, they may polish a blade at a given grit number that the Norton is still cutting. That can be good or bad.
The kings also seem to need an extra stone between the levels of grit so you would be buying three hone surfaces to cover the bases. They appear to have been made to renew chef's knives and only later taken by the American woodworkers and razor people. The Naniwa 3/8. May need a stone between for best results in a given amount of time.
Just my take on the matter. I have King and Norton hones, and others.