We went to Sei for dinner one night while in DC. Sorry for the grainy poor quality photos. I used my iPhone and it was dark. Plus I was trying to be very discreet.
The sushi was good. I ordered the California and the Crispy Shrimp rolls. The ambiance and décor were very calming and interesting. Everything was white and matched. The menu matched the barstools and chairs which was a cool detail. This is a fun yet slightly expensive restaurant. I did notice they have some good happy hour deals on drinks and appetizers. Definitely worth trying out if you are in DC if for nothing else but seeing the décor.