Well, honestly in Bundesliga and Ligue 1, apart from Bayern Munich, Dortmund mainly and PSG +/- Lens and Marseille, the other teams are quite normal although their big names and the name of the players they have.
I don't think that you fully understand the current gap between Saudi league and Budesliga/Ligue 1. Former is ranked somewhere between 50-60 strongest league, which is equivalent of German 3rd league and for that kind of league to come into top 5 you would need an insane amount of money, especially in the country that is not known by its rich football history. Also keep in mind that they don't produce their own quality players (unlike Bundesliga and Ligue 1) which is another big problem.
The Saudi League is more like a show league. They don't seem like they aim to increase the quality of the league much more by starting to grow big names from their youth setup. The only thing they aim is to maintain this show by bringing mostly old stars to make supporters happy. They have oil money and they can easily make way better offers than a European team. This is all about the Saudi League.
Manchester City are preparing to improve their last bid for Gvardiol which was 75 million euros and some bonuses as well. Leipzig insist on demanding at least 100 million euros. I don't expect Manchester City to give up on this transfer because Guardiola wants to see him in his team so much.