It is true that PSG has a good team and a history of league victory, but it is crucial to remember that anything can happen in sports. Lens should not be underestimated since they have shown the capacity to play effectively and cause surprising upsets. In the future games, it will be intriguing to observe how the teams measure up against one another.
They have built up their domination history in Ligue 1 and they are doing it better than Lyon in the past. I said they're doing it better because with their abundant finance resource, they will not sell their star players to improve their treasury and won't easily lose their competitiveness like Lyon.
I don't exclude future when PSG will no longer get owner from Quatar and their finance will no longer be good like now. If bad things won't happen financially, PSG will continue to dominate Ligue 1 many more years. They can lose the title in one season but if we look at Ligue 1 in 5 years, 10 years or 20 years, they're actually winner and dominator.
PSG has more goals than Lens, so if for example Lens wins and PSG loses the next match then they have the same points but PSG are still on top. Unless PSG loses big and Lens can win big, then it's possible that Lens will take over at the top of the Ligue 1 standings.
Goal difference is important because PSG have so powerful attacking and if they won't end this season with less total points than Lens or any club, it is very difficult for other clubs to compare with them about goal difference to be a winner of Ligue 1.
But even so, it will not be easy to maintain a position at the top of the standings because of course there will be greater pressure. But besides that, at this moment the top three teams are very close in points gap, so the slightest mistake will result in their position being taken over.
PSG are familiar with a first position but other clubs are not. So if they take over a first position from PSG, it's very likely that they will lose it shortly after a few match days to PSG. Because they can not maintain their good performance with pressure from top position and from PSG.