PSG are just very lucky that they have one of the most comfortable draws in this stage. However Real Sociedad are still a team not to be underestimated. Because they finished their group as the leader and there was Inter in that group as well. Inter are currently performing much better than PSG in the Champions League.
Therefore PSG had better get well-prepared for this matchup. Otherwise I won't be surprised to see them being eliminated. In the end PSG were nearly finding themselves in the Europa League if it weren't for Milan's comeback against Newcastle.

After Paris Saint Germain failed to finish as the winners of the group F in the UEFA Champions League group stage, I thought they were gonna face one of the strongest teams in the competition when the draw for the first knockout stage is out but surprisingly to me, they got a fair draw as they'll be playing Spanish club Real Sociedad in the round of 16.
That been said, I don't think it'll be a good idea for Paris Saint German players and manager to ever underestimate the strength of the Spanish club when they meet each other in February. Football is a game that's full of surprises and if you consider how good Real Sociedad are, I think they have the needed quality of players to shock PSG if given the chance.