Another data point for you...

I'm 5'4" and when I walk into bike shops, they want to put me on 51-52cm bikes. Then I can't even straddle them! I ride a 48cm WSD bike with a longer stem to accommodate my longer torso. If they made more men's bikes in a 48cm, I'd probably be on a men's specific frame (like my tri bike).

My husband is 5'10" and rides a 54 in some frames, so it really, really varies by individual!