I would say knives have soul stainless or not there is something there, as long as there is a personal connection between the knife and you. Whether it is a knife you don't use often but you find it more enjoyable to sharpen than others, or something you modified and made a better performer out of.
My moritaka for example the KU scale started coming off from the first use and over the next 8 months I helped it along with green srcubbies, and dealt with the ridiculously reactive cladding. It today looks alomost nothing like most moritakas and if you saw the right hand side of it you'd probably never guess it was one of his knives. I would say it has tons of personality, now my Monzaburo Kiritsuke in Ginsanko, I'd say this knife has more soul, I love the dull grey look of the Ginsanko, the way it cuts, the heft of it....., I love them both but the admiration is different. Wouldn't part with either one or any of them.
Knives definitely have soul and it is personal between you and the knife.