Thank you Language Hound and SwissPete. The conversion takes place between friends. I like "what's special about ...".No.
We talk about "the special of the day" in terms of the dish that is featured that day in a restaurant.
I'm not sure what you want to ask about the knife.
Please explain what you mean.
Do you perhaps mean What's special about your new knife?
(Although I'm not sure that a plastic knife would be a very good knife...)
Thank you kentix!That's grammatically fine but not necessarily the question you would expect to follow the first line.
Person A: I just bought a very good knife?
Person B: What's good about it?
Person A: I just bought a very special knife?
Person B: What's so special about it?
Good and special are not exactly the same idea.