Real Sociedad's performance this season has improved quite a lot and they have proven it in the UCL group stage matches and La Liga matches so this will indeed be a serious threat to PSG, but if we look at the overall strength of the two teams at the moment there is almost no significant difference so it is indeed both The team still has the same chance of qualifying for the next round.
Luis Enrique built the PSG team with quite positive progress, even though at the start of the season the PSG team's performance was a little down, but now they are slowly recovering to be better, and indeed in the UCL match against the Sociedada team it will definitely be fierce because every team in the round The top 16 of the UCL are the best teams.
Real Sociedad performed quite consistently this season and not only playing well in the Champions League even in La Liga they only experienced three defeats so far and made them ranked sixth. Real Sociedad will definitely be a threat to Luis Enrique and if he underestimates the Imanol Alguacil forces then I am quite worried they will lose when facing them.
If you see the quality of the players, then I am quite sure PSG can beat Real Sociedad in the last 16, but Luis Enrique must be able to maximize the front lines because Real Sociedad defender is quite solid in defense. So it will make it difficult for PSG to score goals and also have to consider the defense line if they do not want to conceded because Real Sociedad could have threatened their defense if he was off guard.