Nib size vs line width comparison

I look this two videos of M400 EF and F nib, this men write thinner with F nib than girl with EF nib. Men write fast and low pressure and girl write slow and higher pressure, is that reason why EF nib get wider lines then F nib? Also if paper soak more ink than lines are also wider?

Also men m600 EF write wider that m400 F?

So my conclusion is that from other videos I cant find how thick nib writes?

EF nib:

https://youtu.be/QdP9UIsIzBc?t=314

F nib:

https://youtu.be/AJFN9t3VYl4?t=301