Its going to be an interesting period when the round 16 will kick off in the UEFA champions league.The teams that are expected to go through this round to the quater final are Madrid,Bayern,Manchester City, Arsenal,Dortmund,I Include Dortmund because they are so good this season in the Champions league, finishing first in their group of death is not an easy task,so I will include them to go far past the round 16 stage.There are other teams that will push towards making the quater final,but i'm optimistic about this few I mentioned.I really can't wait for this period to come because it is through this league that the best teams in the world are known.Last season,it was Mancity,but I doubt if they will be able to defend the tittle this season.
Some of the clubs you mentioned to enter the quarter-finals make a lot of sense, but I have doubts about Dortmund because even though they are performing very well, it seems like the players readiness is very lacking and they might have difficulty in the last 16 because the competition will be even more competitive in the last 16 even PSG and Napoli are the clubs that will prevent big clubs from qualifying for the quarter-finals.
Inter Milan is actually one of the suitable candidates to enter the quarter-finals because last season Inter was able to qualify for the finals and try to repeat this history even though it would be very difficult, but I would agree more if Dortmund were replaced by Inter Milan.
In fact, Barcelona, if this club had quality players without financial problems, I'm sure Barcelona would also be very suitable to be able to continue the match until the next round, but unfortunately Barcelona in the round of 16 seems to be having a very difficult time competing with other strong clubs.