Masamoto KS is THE perfect, thin, non-laser knife. It is as good as a knife can be, but it is not a laser.
Konosuke White #2 and Konosuke HD perform at the same level, but the HD is easier to care for. The Kono 240s aren't quite 240, while the 270s are so light and handle so well, they might as well be.
The only Sakai Yusuke White #2 I've handled was a heart beat less well finished than the Konosukes. Generally true? Luck of the draw? Quien sabe?
I've never met a Richmond Laser Aogami, and because I dislike san-mai knives so much probably couldn't give it a useful evaluation if I had. But note that the 240mm Aogami is a bit on the tubby side for a laser. It's the same weight as the 270mm Kono HD, and almost 2oz heavier than a 240mm Kono HD.
To my mind these two are as close to perfect as a knife can get. It's nice that both were on your list. Although they're different, I expect you'd be equally happy with either:
- 270mm Konosuke HD, if you're set on a laser; or
- 245mm Masamoto KS, if you're chasing Goldilocks's "just right."