You know…you really oughtn’t put spoilers in the title of a thread less than a week after the work in question comes out. I still haven’t read most of my books from this month since I was on vacation until Thursday. Shining Knight was one of them. I really hope there was more to this issue than the reveal of this fact.
As to the premise you present.
No, she isn’t.
She’s a different type than, Wonder Woman, Power Girl, Zatanna, Supergirl, Hawkgirl, Stargirl, Black Alice or so on…
But they’re different from eachother, too. And being different doesn’t make her better.
What about Sir Ystin makes her better than Wondie? That she doesn’t show as much skin? That she’s a little less pretty, more boyish, in her appearance? Hell, beyond that (and that fact that presumably Ystin isn’t an animated clay statue, and comes from a patriarchal, rather than matriarchal society), how are they even significantly DIFFERENT? Everything that you say in her favour can apply to Diana, too.
Does the fact that Peeg has big tits negate everything else about her character? (Well, OK, when she’s handled badly (which is often enough), they usually do take over. But the writer using her most right now - Geoff Johns - knows how to handle her.)
And, changing the subject, why does the fact that she ‘kicks ass and has a strong moral code’ mean that her appearance doesn’t matter? Why would it matter if she were a lesser warrior, or had a lesser moral code?
Pure male wet dream and complete denial of femininity aren’t the only choices for female characters. Neither is bad, inherantly, to be honest, nor are they really better or worse than eachother.
I daresay my experience - characters like Black Canary, Oracle, Stargirl, Batgirl, and, yes, Wonder Woman and Power Girl being very well liked by female readers because they’re usually used neither purely as sex objects, nor as completely sexless, and are interesting characters, who aren’t turned into stereotypes either in an attempt to pander to male fantasy or in a (usually failed) attempt to counter characters who do pander to those fantasies - holds true in general.
And a thought brought up by my mention of Peeg. It’s how the character is presented that is important, not, strictly, the character’s appearance.
Peeg, despite her famous bosom, is currently presented in a way that isn’t sexist, is very interesting, and doesn’t insult the readers, male or female.
Ystin, with a bad team handling her, could end up as much of a sexist stereotype as any big-bosomed bimbo - a woman who has to give up all vestiges of the female to be strong.