I will occasionally eat sushi locally and I have consumed the Kroger sushi in a pinch, but by far the VERY best sushi I've ever been served was at a Ryokan (Japanese Inn) in Kyoto (in the Geisha district).  I stayed there for a week ... sleeping on a mat on the floor, being served breakfast and dinner each day, having my hot bath (cedar tub) being drawn for me before dinner, etc.  The food was prepared daily by the staff after a visit to the local market.  Of course, each meal was not sushi (I did develop a taste for beef shabu shabu), but without exception all meals were excellent!

One obvious indication of the quality ... the place was filled with JAPANESE patrons.

dd