Even if Lyon's level of play is like in the UEL, I'm sure PSG will play the same role and play the same level of play as in the UCL, so it's clear that PSG is superior in terms of strength and Lyon will not find it easy to beat PSG with a lower level, especially when facing Man United, basically this club is in poor form so it can't be compared to facing PSG who are in good form both in League 1 and in the UCL.
I agree with you. If we talk about the UEL and UCL levels, Lyon may have a chance to beat PSG. But here we are discussing something more specific. Currently, both Lyon and PSG are in the quarterfinals of the European competition. Lyon drew with Manchester United and PSG managed to beat Aston Villa 3-1. If we refer to this match, I think Lyon's level is the same as Aston Villa and Manchester United. And I think we can't say Lyon will have the same level as PSG for now. If both teams meet, I think the match will end in a draw or it will be a win for PSG.
On the contrary there are no easy teams on this part of the tournament, if there were any then arsenal wouldn't have humiliated Real Madrid, inter Milan also wouldn't have stunned Bayern Munich at the Alianz arena, wether Real Madrid or arsenal, the fact still remains that whichever side PSG faces in the semis, they wouldn't find it easier as you are anticipating. This is the UCL and we should sometimes treat every time at this stage as equal. I have learnt something recently.
I think any team that makes it to the semifinals is a team of the same level. Looking at the results of the first leg I assume the teams that will make it to the semifinals are Barca, Arsenal, PSG and Inter. We can see that these four teams are the best teams in their respective leagues. Even if Arsenal and Inter Milan fail to qualify, Real Madrid and Munich are also the best teams in their leagues. So PSG cannot underestimate anyone who will be their opponent in the next match.