This is the abridged version, as my whole text was timed out after I had to deal with a roof leak on MY FIRST DAMN DAY OFF in I'd care not to remind myself.
The three knife houses you proffer offer quite a bit for options, and you don't offer much for information regarding your history, knowledge, or utility.
Konosuke - I recommend the HD, but that's for me. IMO the HD steel is from the G-ds; it will take whatever edge you can give it, it has stellar retention especially after the recent composition change, you don't have to deal with any of the reactive steel nonsense, and they're not cost prohibitive. You are looking at 210's & 240's. Their 240's run a hair short @235, and as they are laser light & thin, they feel extremely nimble in hand... like a smaller knife. Their 210's are really night & day from the 240 as at a true 8" & w/a height of only 42mm, even shorter on the SKD... they feel like a large petty to me. Admittedly, I am rather large.
Masakage - There are three to choose: clad white #2, etched white #2, clad AS.
The 240's run a bit big @245 so beware as you might not want that much knife. They are reactive steel so they will take great edges easily, but being white #2 it will be at the expense of edge retention. As carbon blades, they require carbon maintenance, as well. Albeit, only on the edge in two options. They, excluding the Shimo, will offer less feedback than a mono-steel blade (e.g., kono hd/hh/#2, AEB-Laser), as well.
Richmond - I will read you literally and comment on the AEB-L. This is your only stainless option other than the Kono HH of which you never specified. This stainless steel is one of the best you can get at the price point, and in the same breath, the Richmond is a great bang-for-the-buck; I am not discounting the quality of the knife either by saying that. This may potentially offer the best ergonomic for you as @230mm & IMO a nearly proportionately perfect 48mm height. She offers a thin light option.
Like I said, I don't know much about where you're at & what you need a knife for...