Two in-form teams failed to meet. Lens drew 1-1 with PSV at home. Of course this result is a success for PSV. If I remember correctly, Lens finished 2nd in the league last season with 1 point difference behind PSG. A 1-1 draw away to a team that dominated the French league last season must be promising. Both teams had plenty of chances but didn't make the most of them. We could have seen more goals in the match. I don't know if PSV can get out of the group but I think this group will be more competitive than the other groups.
PSV are really in a tight situation no doubt but it was actually quite expected as their are not that strong when it comes to playing in the champions league. But when it's comes to comparing these two team performance currently now , I think I would count PSV a better team because of their ability to win games their league and although their opponent the french team actually finished second but still no doubt that this PSV team is actually better in performance.
This group could still go anywhere, but Arsenal is now in the driving seat as they have their 6 points now and they have 2 games at home in the last 3 games. This makes a significant difference regarding the competition for rank 1 whereas Lens now has had their opportunity in this game against PSV to take an important hurdle towards the next round in the Champions League. This draw isn't quite what they wanted. A win would have been huge because now they know what to expect from their last 3 games with 2 games being away against Arsenal and PSV. That's why PSV still isn't lost here. It is unlikely that they will score against Arsenal, but they will get their final game against Sevilla, which ended in a draw in the first leg, which means if they win it, they would also win the comparison in case they end up with the same number of points.