Believe me or not, I handled several KM2000 and I confirm the thickness of the blade is 3mm. That said I agree a good heat threatment is more important than the thickness of the blade but I doubt in this case that the KM2000 as the same heat threatment than a Cold Steel X2 for exemple ... :jerkit:
Strange, I am holding one in my hands right now. A ruler might not be the best way of measuring the thickness of the blade, but as far as I can tell it's between 4.5 and 5mm...
4.8mm being 3/16 inch it looks like the CS Master Tanto and the KM2000 have equally thick blades.
What CS do to their knives in their Solid Proof videos is impressive, and it is not unlikely that some of their knives are tougher than the KM2000. I can't tell for sure because I don't own a CS fixed blade. But the KM2000 is definitely no piece of junk, although I agree that it's overpriced at $200.