A male here. I somewhat disagree. I do love the idea of two wives in a catfight, absolutely !!!. However, your term "brutal" is not erotic and is not going to turn me on. I am not a fan of violence at all. Sorry. I do not want the wives getting seriously hurt. Slapping and pulling hair is fine, but I don't want to see someone with broken bones, a concussion, dislocated foot, loss of tooth, etc,... There's enough of that in women's MMA/UFC.
However, a scenario that would be erotic and would make me horny as hell would be something where both women are at the office, wedding, party, dance club, etc,...wearing nice clothes (dress, business suit, etc,...) and barefoot and the catfight starts where they try to rip the others clothes off. Now, that would be sexy as hell !!!