Hitachi are my favorite steels for kitchen knives, they are a joy to sharpen and even a bigger joy to use, IFYKYK ! LOL. The 2 knives on the left in the photo above are made by; Shiro Kamo, they are SG2 powdered steel core, which is similar to R2, and they have a Stainless Damascus cladding, 63+HRC. 135mm Petty and a 210mm Gyuto.
The next is a Anryu Hitachi Blue #2, 210mm Gyuto made by 4th generation blade smith Katsutoshi Anryu, he retied a few years ago and his nephew took over. I was lucky enough to get this one before he retired, the price on his knives has skyrocketed in value, I have had many offers to buy it. I have several of his knives.
the last is a Masakage Mizu 210mm Gyuto, Blue #2 made by Ikeda San, Its an older knife and a little more plain but what a workhorse and steaming sharp like the Anyru.
Those four get used all the time and are my go to knifes 90% of the time. I have a bunch of others along with several single bevel, a Sakai White #2 Mioroshi Deba 210mm and a SAKAI BLUE #2 DEBA 180MM, I use them both for processing tuna and other fish and the 180mm for breaking down chickens and turkey and such, great for processing a bunch of ducks and geese.