Kobe: Three women able to play in NBA...

[Dahlsim]

I think the Williams sisters are a couple of the best examples of women at the pinnacle of their sport.  This was an interesting test against "highest level" male competition. 
1998: Karsten Braasch vs. the Williams sisters

Another event dubbed a "Battle of the Sexes" took place during the 1998 Australian Open[56] between Karsten Braasch and the Williams sisters. Venus and Serena Williams had claimed that they could beat any male player ranked outside the world's top 200, so Braasch, then ranked 203rd, challenged them both. Braasch was described by one journalist as "a man whose training regime centered around a pack of cigarettes and more than a couple of bottles of ice cold lager".[57][56] 

The matches took place on court number 12 in Melbourne Park,[58] after Braasch had finished a round of golf and two shandies. He first took on Serena and after leading 5–0, beat her 6–1. Venus then walked on court and again Braasch was victorious, this time winning 6–2.[56] Braasch said afterwards, "500 and above, no chance". He added that he had played like someone ranked 600th in order to keep the game "fun"[59] and that the big difference was that men can chase down shots much easier and put spin on the ball that female players can't handle. The Williams sisters adjusted their claim to beating men outside the top 350.[56]

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Baketball is all about athleticism and size. Even the best scheme and incredible skill cannot make up for it. That said in other sports the difference is overrated.
When I was still in Germany my soccer team (all players 16 years old) played a friendly match against a league 1 women teams. Lost 1-8. Athleticism was slightly in our favor but they embarrassed us. We barely touched the ball all game long.
That´s obviously not possible in basketball but I think in a sport like baseball, volleyball or soccer it is possible for women to play at the highest level.

Might agree about the differences from sport to sport but when you say at the highest level, I don't think so. 

Keep in mind at the highest level seconds and fractions of the second in speed, slight advantages in strength and acceleration, jumping ability etc. is what separates even the men at the highest level from those that drop down to the next level.  

Physical reality enters into play.  It sounds like even in your soccer example is similar to other sports where the men or man is taken from a lower level of sport to play and compare against higher level females.

I guess that´s my point. Team sports that aren´t focussing on individual athleticism are the best options for women. I don´t see a reason why a woman cannot be a great setter in volleyball for example.

I agree with you there.  You could isolate a particular role on a team and there you have your chance for women to get to the highest level with men. 
A Goalie in hockey a setter in volleyball a field goal kicker in football are a few interesting examples.