Kai Sushi Lessing is highly praised for its exceptional quality of sushi, creative dishes, and fresh ingredients, particularly noted for its fatty salmon, nigiri selection, and unique sushi variations. Guests appreciate the welcoming and friendly staff as well as the pleasant and chic atmosphere, which makes it suitable for various occasions including family gatherings and special celebrations. The sushi-making courses offered are highlighted as a unique and enjoyable experience, with expert guidance and a lively, personal touch. While the food consistently receives high marks, some customers noted occasional issues with seating arrangements, wait times, and service attentiveness. A few mentioned language barriers and service inconsistency, but these do not overshadow the overall positive dining experience at this renowned Japanese restaurant in Zurich.