I’m interested in buying a yu kurosaki sg2 knife, but I’d like to understand the difference between the various production series. For example, the Senko line seems to be the cheapest sg2 line, while the Fujin line is $100-$200 more expensive, and the Shizuki is in the middle. Why the difference in price if they all use sg2 for the steel? Are they made differently? Or is the sg2 in the Fujin line higher quality than the others?