I have a set of 6 virtorinox steak knives from the 90s, that turned into general purpose kitchen knifes. They are now finally starting to become blunt. The black platic handles are smooth from use. 30 years on, ithink the time is approaching for them to be replaced. And that is only because I cannot sharpen the serated blades.

I can attest to this, I met my wife 9 years ago when she already had this knife in her kitchen, and we still actively use it tosay. A cut above the rest and holds a good edge after sharpening too