Scallop is a simple delicacy compared to the other more exotic seashell options. You will expect them often in a sushi restaurant. I think scallop only taste good when served raw and it loses a great deal of its taste when cooked. You can taste the Unami (rumoured 5th sense of taste, representing freshness, just like eating MSG) of the scallop when it is served fresh. And it tastes very good in that way.
You should look for sushi grade scallop. In the US the sushi grade scallops are flash...
