For some reason, I also had doubts about PSG this season, they don't seem ready and their strength is only strong in Ligue 1, but not in the UCL league. Even though they are trained by a great coach like Enrique and have star players, they have not been able to show their toughness in the UCL. Just look at PSG qualifying for the round of 16 through luck only with a difference in goal difference with AC Milan.
I think Sociedad will win the match, because Real Sociedad's game is so solid in defense, very good at controlling the ball, and killing counter attacks through player Kubo.
PSG's performance at the start of this season did indeed decline slightly compared to last season, but slowly they can continue to develop their team's performance in a more positive direction and that makes their chances in the last 16 of the UCL even greater and the opponent they face is Real Sociedad, if We look at the quality of both teams. I think PSG is a little better than Real Sociedad, so I don't doubt that PSG's percentage of getting to the next round is much greater than Real Sociedad.
PSG performance has improved much more than since the start of the season, but they need to be even more solid in the Champions League because the competition in the future will be even tougher. The opponents they face in the round of 16 are slightly weaker than PSG's squad, but Luis Enrique should not underestimate Sociedad because their ambitions are very big this season.
The Champions League always provides unexpected surprises, PSG, who have qualified for the round of 16 with great difficulty, need to play more solidly to reach the quarter-finals. After that I can't say much more about PSG if they make it through to the quarter-finals because the fewer clubs that survive the smaller their chances.