I've owned most of those knives. The Tesshu I have is at least as hard as the Masamoto, Sakai Yusuke, Ashi Ginga, Gengetsu and plan Konosuke white 2. In other words, they all seem about the same, since we are cooks, and not measurement instruments. If anything, the Tesshu I own has held its edge better than most White 2 knives I've used, and I've given it a fair shake, so far. The one I have is a great knife. I hate to sound like I'm a shill for Aframes, but I wish I were: I'm just trying to pass on a good deal. There aren't any catches, as far as I can tell, other than a retailer who probably isn't making a big profit.
I used the Tesshu next to the Tanaka R2 I bought from Chubo, this week, and I do slightly like the R2 better. The R2 is also about the best knife I've ever owned, and it's twice as expensive. I wish the Tanaka gave a nice patina, but stainless is stainless.