I like
this video, which explains that women are capable of good disguise with a "sex change", and men will always be visible)
Just from videos looking at a androgynous person it is quite easy to understand the true sex.
ftm in the ideal pass is really impossible to recognize (Not everyone is lucky with good masculine, but still they pretty look like men)
Although "cis" women don’t even have to try hard, they just don’t correspond to vigorous femininity, and boom, they are already being mistaken for men, lol.
But mtf just dont exist in an ideal pass i think