With the way PSG performed in the group stage of the Uefa Champions League, I do not expect PSG to progress to the quarter-final of the Uefa Champions League this season, but PSG had an easy draw in the round of 16 against Real Sociedad, and they will win against Real Sociedad to reach the quarter-final of the Uefa Champions League.
Since PSG will play against Real Sociedad, I'm very sure that they will have a good chance to qualify for the next round. It is true that PSG didn't play consistently during this season, they sometimes got surprising defeats or draws. However, I believe PSG has much better quality squad over Real Sociedad. PSG still have some stars players in their squad, they have a special advantage in the match against Real Sociedad.
When the draw for Uefa Champions League round of 16 where made I knew that Paris Saint-German would win against Real Sociedad because PSG had more experience players who had played in the Uefa Champions League than Real Sociedad, and that will help PSG best Real Sociedad.