One is the ww2 kai kunto you have seen here.The second one goes back years ago (i was a little kid) , it was love at first sight. My father (he is a collector also) says it was a Kanezane sword.I took the sword secretly and i hit a plastic action man toy i had with not the expected results i had as a kid (cut it cleanely) , then my target became the couch in the house , which the result was a cut on the couch but not deep enough.Having seen this two swords i had this question , how did the samurai cut down people with armour when i couldnt cut a plastic toy or make a deep cut throught the couch.Now , dont blame me , i was just a kid that wanted to play samurai , now i respect and honour the items i have in my possesion like a treasure.Thats my story and how i came to ask this question about the sharpness.
Below is the result on the couch...