If it's a good one, and especially with a lot of domination of one over the other, I get turned on a lot.
Unfortunately, a lot of the 'real catfight' scenes are done by some redneck bloke with a phone recording two mildly unattractive drunk, stupid, or both, female idiots shouting at and slapping or kicking each other, which does nothing for me at all.
Very few of those real catfights are sexy to me, most I find stupid, but those videos in which two girls on a mat really wrestle and compete, or a well done acted out domination one, those hardly ever fail to make me feel I'd love to be in bed afterwards with either one of them.
I can fantasise about having sex with the girl who lost and got humiliated in the match while we keep talking about her defeat, and that gets me really turned on.