Loaner knives make a good source of the free test knives, at least for me. Substantial portion of the kitchen knife reviews on this site are based on loaner knife tests. In a way, loaners are more interesting that brand new knives, as they provide free data on knife durability, usability and so on. Well, all that of course needs to be considered in conjunction with the user and his or her habits. In that, just because one knife came to me with few dozen chips on the edge doesn't necessarily mean failed heat treat or a bad knife, perhaps the user was misusing or abusing it :) Things happen... Anyhow, the other day, around December 2012 I got an offer to test few knives, and one of those knives was Miyabi 5000S series yanagiba. By now, I did manage to accumulate half a dozen Miyabi kitchen knives reviews from various series 7000MC, 600D Morimoto editions, 5000MCD and a few more. All of the reviewed knives were loaners, just like the 5000S series yanagiba reviewed here. I knew about 5000S series Miyabis, because at some point there was a mixup on one of the dealer's site and 5000S series were sold as different series knives, which obviously lead to complications, although that's an old story. In short, 5000S series is the westernized version of the Miyabi kitchen knives, where westernization comes not through the design change, but through the choice of the blade material. 5000S knives use German X50CrMoV15 steel or some variation of it, with Henckels proprietary ice hardening heat treatment process, which I suppose is some sort of cryogenic treatment. Well, from the design point of view, that's not much of the westernization is it, but as far as the knife use goes, by replacing hard steel with much softer one, knife use pattern changes and so does its performance. Part two making the knife more westerner friendly would be the use of the symmetrical edge, vs. traditional chisel edge on yanagibas. Basically, if you want to be precise, it's a westerner friendly knife, not a westernized one. And since we're digging those details, apparently, 34507-240 model number is for the one with symmetrical edge and 34507-241 is for traditional Japanese chisel edge yanagiba. Miyabi website does mention both edge types specifically, although if you try to find 5000S series information in Miyabi's non flash version of the website, you won't succeed, it simply isn't there. However, 5000S series does exist in Miyabi's flash version of the website. At this point I am not sure if 5000S has been discontinued or not, one version has it, other version of the same company site doesn't have it, go figure. I guess, that's enough about the knife naming and Miyabi website issues, let's move on to the knife itself.