It is so funny. I was reading AJC this morning. Merdith Ford wrote an article about Japanese knife.
That one is Santoku.
I just got this picture's knife yesterday.
This knife is great for cutting rolls. I've been using same brand for many years. I use same brand at my home, too.
The reason is very simple, no rust, last long, easy to sharp.
I bought this $39 at Marshalls. They also sells Santoku for $25.
I am a Japanese but use German knife. This comes from my 13 years of experience. For cutting fish and sashimi, I use Japanese knives.