I have the Norton 4/8 but am debating replacing it with a Naniwa SS 5k and 8k. I already have the nani 1k which I love. Looking at the scratch pattern/polish it seems the Norton 4k is a step down from the nani 1k? I know the two companies don't use the same grit scale, but am I way off base with my assessment? Looking for some opinions from honers more knowledgable than I. Will the nani 1k, 5k, and 8k be reason jumps between stone?