You can't compare this PSG team with the Barcelona team that Luis Enrique once managed and won the Champions League title with. PSG has several good names on paper, but they have had their problems in the Champions League as well. They could not beat Dortmund in the second game and they got destroyed by Newcastle 4-1 in the first game and couldn't win the second game either. Where is Newcastle now? Out, they are not even in the Europa League.
I think these results in the group stage are reason enough for Real Sociedad to assume that they have a good chance to progress to the quarterfinals. I am not saying they are the favorite, but I am saying they have a good chance.
It's true that PSG is compared to Barcelona when luiz enrique coached is not comparable, in the era enrique coached the Barcelona squad was the champion squad of the guardiola era. there are big names messi xavi hernandez and more. so if luiz enrique's size is clearly not comparable. but for real socieded to beat PSG is also not very easy, which is favored in this match is clearly PSG. in addition to his squad with many stars enrique is also very familiar with how to play Spanish clubs. besides being Spanish almost his entire career enrique also played in the Spanish league.
And Real Socieded can be the group winner is also very lucky not because of the good quality of the game.
Here we can give advantage to PSG even still we have to watch all things on ground, but comparably we can say PSG is strong side and Real Sociedad which is currently having sixth spot, and they have the best defence, but their attack is also not effective which is needed for the better results in Champions League specially for the knock-out round where things are mostly needs aggressive performance from the teams for the better results.
PSG having lethal attack which can break their defence and backbone as well and with this all Real Sociedad is having no attack which can give them good results in last three games they have two games without scoring any goal which is also giving all details how things are working for them in this season in La Liga in group stages they were not able to score goals against Inter Milan and Salzburg in away game and at home as well.