I've changed kitchen sinks. It's not a tremendously complicated process with some, and can change the look of a kitchen. One thing I don't care for is the kitchen sink in the island. I never thought much about this, until I visited a relative that had one.
I don't see how this is sanitary. So much food is prepared, and served from an island, and when the water is turned on, any nasty water in the sink can splash on the food. Maybe I'm being too cautious, but the popularity of sinks in an island just doesn't make sense to me. The sink is where dirty pans, and dishes, accumulate. Just the sight of such things can curb my appetite if they're in a serving area.