Yes, this is one of the better sushi places in Mesa (maybe even in the whole valley), but it's not the most amazing sushi on a global scale, or even a national scale for that matter, so take your experience with a grain of salt.
Beautifully presented and fresh tasting eel, spicy salmon was also very good. Sake and beer drink prices are pretty standard, but I like having a drink here because the restaurant itself is pretty quiet and relaxing. It's easy to have a good conversation with someone over some sushi at Sekai.
Expect a good amount of time after ordering before you receive your sushi. They usually only have 1, maybe 2 sushi chefs at any given time. My rating is on an "AZ Sushi" scale. Yes, I'm a snob.