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.
I'm keeping steady tater tots and relaxed at home, hoping to enter the new knowing confidently that Les Parisiens will qualify to the next UCL phase which is the round of 8. There's experience and there's action, better to engaged in both because that's the only way to build up good connection for the matches that ought to be played. The UEFA Champions League Round of 16 have be classified easy for Paris Saint-Germain but they can also messed things up for everyone, we know how vulnerable the club can be and I've solid idea of Real Sociedad becoming one of the underrated club and that's good points for Sociedad to implement and strive for good spot.
I completely understand your belief that PSG will make it to the round of 8 in the UCL. It looks like they'll win because they have a strong team and Mbappe is dedicated and talented. However, I must say that Im somewhat concerned about what follows. While the quarterfinals are a completely different game, PSG hasnt always done well in important UCL moments. Premier League teams like Real Madrid and Manchester City are playing very well, and it doesnt look like PSG will be able to beat these big teams. Although PSG wants to show me Im wrong, I have a sneaking suspicion that their journey might come to an end in the quarters.