Yes, Chef.

I honestly think that the group "kitchen staff" should be considered as a new demographic classification... You know, senior citizens, native americans, middle class, kitchen staff. It is a separate culture of its own that you won't find anywhere else. From my experience for your knowledge, here are the only acceptable phrases to be used when working in a kitchen: 

"Yes, Chef"

"I'm sorry, Chef"

.....

and that's about it.