I made a video showing the difference a sharp blade makes in cutting various items.
I used only two steak knives and two chef’s knives. One of each was blunt. I sharpened the other two with the Lansky.
My sincere apologies to videographers everywhere, for the terrible video. I hope to improve upon my video making skills.
How long does a blade stay sharp?
I can’t answer this. A blade’s toughness is based on the type of material it’s made from and the type of treatment it received.
If your knife is made from the wrong metal and / or they messed up the heat treatment, it won’t stay sharp. You’ll spend more time on sharpening than you should.