I eat with both s/f/k and chopsticks but depending on what I'm eating (sushi or steak) and where I'm eating (Chinese restaurant or Tony Romas) I use the more appropriate utensil(s).
<< I mean can you cut with a chopstick, can you spread butter with a chopstick, can you twist noodles around a chopstick with one hand. >>
I use chopsticks to cut through soft foods like tofu. Never tried spreading butter with chopsticks, probably can't be done well, but sounds interesting nonetheless. YES, I can twist noodles (ramen, spaghetti, etc) with chopsticks using one hand. A good pair of chopsticks (I use gold/silver ones) can be very versatile and is useful for almost any situation. The Karate Kid can catch a fly with his!