Graphene is often referred to be the miracle material out there. It is relatively new and it is not so common in many applications because many tests are still ongoing and its long-term efficiency is not known. Its strength is extreme, but at the same time, it is super lightweight too and can definitely outweigh carbon fiber.
However, you are less likely to find graphene knives out there. The material is considered quite innovative, and a few automotive manufacturers currently use it for parts.