Hou Yifan, the top female player, is above 2600, which by any objective measurement is really fucking good. That's good enough for top 100 players in the world regardless of gender. Just because she isn't competitive againts Magnus doesn't mean there's a gender gap....because TBH nobody is truly competitive against him.
So it seems, yes, there is a pretty clear gender gap.
Better question: Even if a woman was magically guaranteed to both be in the 1% of chess talent, and to be unaffected by sexism...would "work at becoming a competitive chess player" be a rational life choice for her to make?