I have a Kershaw Vapor 3" plain blade. It looks a lot like the RSK-1 from Doug Ritter which I can't afford. The vapor I have is very good and keeps the sharpeness for a long time.Also the blade looks a lot the same. I know that the RSK-1 must be better but I don't have one to compare it to the Vapor in everyday use. Is the RSK-1 so much better that it is worth the difference in price and in which ways it is so much better?