My favorite Seattle sushi place is Chiso in Fremont. Maybe you can argue that some other place is better in this or that way, but Chiso wins best all-around in my book. The environment is cozy, yet stylish. The sushi is fresh and delicious, the service prompt and courteous, it's not hard to get a table (unlike some places), and parking is no big challenge. Plus Fremont is fairly central (at least for north Seattle folks). Plus it's the best quality to price ratio I know (excellent sushi for mid-level prices).
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