That is what you think about the match but football is beyond and more than that because and in football anything is possible though merely looking at what they played Liverpool and there performance it is certain or convincing that they will win Aston villa but that is not how to judge football although I haven't seen there history, if at all they have history. Me personally I think Aston villa will beat PSG and quality for semi finals though it is going to be a very tough match .
The history that cannot be denied is about PSG who have never won the Champions League until last season, although for this season I personally still can't be sure. And for the match between PSG and Aston Villa, almost everyone will favor PSG as the team that will advance to the next round, but that doesn't mean we should think that Aston Villa is weak because it could be that the team will prepare a clever strategy to be able to beat PSG in the quarter-finals this time.
even if PSG would eventually not go down to the finals of the Champions League, Aston Villa is not in that category of teams that are strong enough to stand in their way to getting to the finals. it is quite true that any team that has gotten to this point of the tournament should never be looked down on but for the teams in the part of PSG, the only team that can stop them from getting to the finals is just Real Madrid. if by any chance Arsenal wins Real Madrid, it becomes completely certain that PSG has a chance of playing in the finals yet again.
regarding the order of quality in the remaining teams, PSG and Barca are the most complete team that looks like the favorites to contend against themselves in the finals but because we have real Madrid that always finds a way of making things happen even in times you have written them off, they still stand as a tough opposition that is ready to give in their all just to defend their champions league title and if possible get the 16th one.