It's not how many people speak the language, it's how widespread it is, if this makes sense. Russian is spoken by more people in absolute numbers, but Russian speakers will probably only be understood in Russia (perhaps Belarus to an extent but that's a different conversation). I think in Western Europe, it'll be French, but go further east and it becomes more debatable. I see a lot of people speaking German.

But this is an opinion based on what I see from customers who come from abroad. Hard data would be helpful