On a metal level, which is fairly connected to a storytelling level in this instance, Marvel simply doesn't have a female character like that. They don't have a Superman either, really. Best you can equate is Spider-Man to Batman, but even that is stretching it. It's going to take a few more decades before the Avengers and/or the X-Men become the icons DC's Justice League is, and it's only more apparent with female super-heroes because Marvel had never placed any of them on the forefront before the late 90s - early 2000s.
In regards to Wonder Woman in particular, large part of her being a feminist symbol and a famous character with unique charm is the ancient greek mythos she is tied to. Marvel's invested more on norse mythology, with Thor, and I think these two characters are more comparable than Diana is to any female Marvel character because of this. The Wonder Woman character has something classically special to offer that her male peers and Marvel's Carol Danvers, Emma Frost, Jane Foster (whom they tried to make into a female version of Thor but pretty much failed) and all these ladies they're seemingly trying to promote don't have. Wanda and Natasha are good, popular character, but they were never going to be what Diana is because their core traits are not remotely that. On a strictly character level, the closest female equivalents Marvel has that I can think of are Sif or the Valkyrie, but they never actually made good -- or any real -- use of Thor's supporting environment, neither in the books nor in the films (the prose they're releasing currently is a good step forward), so it's a little too late for that. Basically, it's going to take time for them to undig, create and/or shape a female character that will compare.
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