Reviews for Sushi Koshu in Diamond Bar, CA

Fantastic sushi restaurant! Food was great. I ordered the Tempura combination and it was so goood! Thank you Sushi Koshu!

They?re so nice! The photos should tell you that the food is excellent. Looks super fresh not much to say. We got a boat, sushi... boats? what?s that all a-boat?! DO. YOU. GET. IT? Isn?t it funny to think about? The fish was once alive in the ocean and thencaught on a boat, and now served on a decorative play boat? something to think about Read more

It's not owned by Japanese. The food is expensive but doesn't match the Japanese sushi quality. Try it out yourself once and you... will know. Just make sure you order the cheap sushi first to see Read more

Edit: April 2022 - ordered our usual ?Take set? the price of this set went up but I feel as if the quality of this dish has gone... down. Previously, the roll that came with this set was a tuna maki roll but that got switched with a California roll ????. Nothating on a California roll, but that?s not what I paid for. The rice was unseasoned and no wasabi between the rice/fish, someof the toppings were missing. The finesse of the meal was gone. It kind of reminded me of an all you can eat sushi place. Fromother reviews, looks like the ownership may have changed. Old review: Finally tried this sushi location and glad we did.Ordered 2 hikaru bento boxes ($80/bento - June 2020) for our wedding anniversary. Ordered to go and it came with a paper guidewith chef recommendation order (missed one letter (b in the picture) but that?s not a big deal - I am curious though in where itwould be placed in the order. Bento box was portioned into 4 sections - white fish and seaweed salad, nigiri ???? set, chirashiset, and cooked fish/crab. Also came with an egg custard and matcha pudding. Definitely would recommend. Looking forward totrying items from their regular menu in the future. Read more

Parents of a friend from awhile ago owns this place. Was told about their Hikaru Bento and had to try it. Definitely wish I had... not nigiri or sashimi instead of the comes fish. Maybe they can substitute if you ask. Not sure if it's the same every timeeither. Overall though it was really good. I never questioned the pricing while I was eating. Read more

All the sashimi are so fresh and yummy !!!! Friendly staffs, very good Japanese family owned business with fair price. Best if... you sit at the sushi bar and order the fresh / live items of the day. Sometimes it will get pricy since it's market price, butyou can always tell them if you have a budget or your preference of the fish and they will arrange for you. You can also order 1by 1 unlike some places that only allow you to order omakase at sushi bar. Read more

Decent Japanese restaurant. My group ordered a big sushi boat and a bunch of other items. I chose the sukiyaki don. The fish is... pretty good and the sushi was a favourite among the group. The rice bowl could've been better. Staff weren't that attentive. Wetried getting the attention of two waitresses who were chatting with each other and the person who helped us in the end was awaitress taking an order for another table Read more

The BEST sushi ever. Live scallop, clams, crab, shrimp, and FRESH fish for nigiri sushi. So, so, SO Good! Great sake options.