A couple of weeks ago, I gave myself a Hattori knife for Easter. I've had a couple of really good German and Japanese knives for about ten years, but this thing is scary hair shaving sharp. Frankly, I am a bit scared every time I use it. It cuts through tomatoes, peppers, meat and miscellaneous veggies basically by putting the cutting edge on top and watching it melt through the object. In one case, I accidentally cut through a polypro cutting mat. Obviously not a bread/chopping/deboning knife, though.
Thankfully, I stopped intimidating tomatoes in pseudo Japanese slang before using it.