That shapton glass setup with the 500, 2k and 16k mesh is not designed for a mirror finish. Its designed to give the professional working cook/chef a polished toothy edge that well afford them the balance of a precision edge with the "bite" and longevity of a more aggressive edge for cutting ingredients.
If all you seek is a mirror finish and the fastest,cheapest way to do it, get a work sharp belt sharpener.
just understand that high polished edges are not the zenith of performance.
We can geek out on the subtle differences between the naniwa and shapton but realistically you have to think of them like coke and pepsi neither blows the other out of the water it just comes down to which subtleties suit ones preferences.