Las Vegas has very good Japanese restaurants but is not the best city for sushi unless you can afford Bar Masa at Aria which is an offshoot of the NYC restaurant.

For smaller budgets, there are several good choices especially for all you can eat sushi.  Unlike regular buffets which can be somewhat consistent, there is more variability in sushi buffets.

Izakaya style is usually cheaper and often more fun.  There are 2 good recommendations for Vegas.

Top Sushi Restaurants in Las Vegas

Okada (Wynn) and Nobu (Hard Rock) are the best sushi restaurants in Vegas.  Okada has a very good sushi bar and the best omakase which is a chef’s tasting menu that can vary day to day.  Their o-toro is outstanding.

Nobu has some outstanding dishes along with some okay offerings.  Yellowtail with jalapenos, miso cod, rock shrimp, and creamy spicy crab are some of its better items.

We prefer Okada for its great waterfall view and better omakase.  Nobu is sometimes a bit loud with tables close together which can disrupt a serene meal but is better for people watching.  Both are expensive and Nobu can surprise you because they price by the piece rather than a serving of 2 pieces.

Very Good Sushi Restaurants

Not very far behind and sometimes superior to Okada and Nobu for certain items or factors are Shibuya, Hyakumi, Sushi Roku, Hamada, Osaka and Sen of Japan.

Shibuya (MGM) has the best Las Vegas sake list, good sushi overall and tends to be more consistent with uni than most restaurants.  Hyakumi (Caesars) has a slightly better sushi bar with a good yellowtail collar.  It is hard to get the meat out of collars but it is very tasty when you do.  Hyakumi is across from a bar so it can get noisy.

Sushi Roku (Caesars Forum Shoppes) has a Strip view if close to the windows and fairly good sushi with a decent lobster roll.  A Japanese purist might avoid anything kara as being originally Chinese cuisine adopted in Japan but if all you want is good food, their chicken karaage is not bad.

Hamada (Rio and off-Strip) is one of the pioneers of Japanese cuisine in Vegas with a good combination offering and better than average tempura. 
Another pioneer was Osaka (off-Strip) that also has very good tempura.

Sen of Japan (off-Strip) was founded by the former Nobu sushi chef.  Omakase runs about $100-$135 at the better sushi restaurants on the Strip such as Okada and Nobu depending on menu.  Sen’s omakase is $50 but may have non-traditional Japanese items.  They have good azuki (red bean) ice cream to finish.

Any good sushi bar is perfect for dining alone.  Buffets are also good with Izakayas the worse for single diners.

There are 2 distinct groups: sushi buffets and made to order neighborhood sushi houses. The early pioneers Makino and Todai keep prepared sushi cold waiting for the diner to choose them buffet style. The smaller, neighborhood sushi restaurants retain a more traditional atmosphere and prepare sushi to order although they may stage some preparation before hand.

The neighborhood sushi houses are often fresher with more imaginative sushi roll offerings than the older sushi buffet houses. We prefer these smaller neighborhood venues but the convenience of a sushi buffet for a visitor plus the other offerings such as crab, hot dishes, etc. might sway someone especially if they don’t have a car rental. Here are our favorites :

Nigiri

Blue Fin

Oyshi

Hikari

Rolls

Most Vegas neighborhood Sushi Restaurants

Sin City Sushi

Hawaiian

Island Sushi

808 Sushi

Budget

Yama Sushi

Fuji San

Sushi Tashi (if drinking)

The most popular forms of sushi are nigiri or individual pieces of sushi that come 2 per order (unless dining at Nobu where you get one) or rolls which are multiple pieces made at the same time and are often the most Americanized offerings.

At the small sushi houses you make selections that limit premium nigiri such as uni, amaeba, (sea urchin, sweet shrimp) to just one order. They also limit you to one hour or so to finish eating unless you are at Island where they seem to be more on laid back Island time.

Most of the neighborhood style sushi restaurants are very good and creative at rolls—sometimes more on the names than the combinations. If you are open to non-traditional items and flavors, the rolls often match well with the U.S. palate. Also, hamachi or salmon collars are usually pretty good any where you get them. Nigiri quality seems to vary more and may have tapered off a tad over the last 6-12 months.

Compared to ala carte, the All You Can Eat savings can be very dramatic—50%+ if you are a big eater. However, there can be a pre-prepared aspect to the “made to order” sushi such as the rice for the nigiri. Quality is usually better for ala carte in terms of freshness and a higher fish to rice ratio although Fuji San and Kan Pai don’t seem to skimp much for their All You Can Eat deals.

Makino has the lowest prices for lunch with Fuji San followed by Yama as the price leaders for dinner. There tends to be more similar pricing for sushi buffets than other buffets with many dinners in the $26 area. Most lunch All You Can Eat sushi deals are in the $21 area with Kan Pai the lone same lunch and dinner price.

Pricing is similar due to competition. There are also some sushi All You Can Eats that share(d) common ownership which also explains some price and menu similarity.

Sushi Factory has 2 locations with pretty much the same menu except that their Eastern location has a few ala carte items $1 more expensive than their Tropicana restaurant. The 2 Sushi Mons are now separately owned by the former co-owners but with some remaining menu and pricing similarity.

Here are our rankings for the Vegas All You Can Eat Sushi Restaurants: