No one has asked for this and no one probably will. I'm also not sure if I've talked about this topic before but I still want to address it.
Why do I talk about Martina but hardly, if ever, talk about Sam or Vincent?
Before I start I do want to mention that I will talk about Sam at some point cause I find what we know about his character interesting.
Now the reason I don't talk about Vincent is mainly because I don't think he's all that important to the story as Sam and Martina, for me Vincent is here as a reminder to Jack on what he gave up in order to keep the world safe, at least that's how Jack views it. To me what we know about Vincent, that he's Jack's ex, that he's married now and living a normal life, is all we need to know. It's implied that he and Jack broke up long before Zurich, possibly even either when Jack got the Strike Commander position.
Again with Sam I do find his character interesting, and I am going to talk about him at some point but I don't talk about him in the way I talk about Martina because we are given hints about his character. The relationship between him and Pharah is stated as being complicated, he's a Public Servant but as far as we know wasn't a part of Overwatch, hell we even know he and Pharah enjoy butter tarts around the Christmas holidays. We know so much more about him as a character outside of his relationship with Ana compared to Martina.
Which brings me to why I talk about Martina, all we really know about her was that she was kind, forgiving, was married to Gabe, has a son, and has since gotten a new partner. Now usually I wouldn't have a problem with the if it wasn't for the fact that in CoV, she used as Reaper's motivation and that's it, she's just used in a very misogynistic trope and that's it. Part of who I am, both as a person and a writer, is that when I see a character with so much potential being written terribly either in canon and in fandom, I want to fix it.
And with the Reaper and Widow interaction;
Widowmaker: Are you ever tempted to contact your wife?
Widowmaker: Afraid she would try to kill you?
Reaper: I'd be surprised if she didn't.
It gives me some hope that she is actually more of a character then what we were given in CoV and we might eventually see more of her. Until then I'm going to continue to headcanon Martina as a badass ex-Overwatch agent and no one can stop me!