With the way Barcelona have been handling every games both in the Spanish league and in the champions league, just one loss against a Ligue 1 side which is Monaco ever since then Barcelona have been winning convincingly without any dropped point. At this point I don't think any team can make them lose that wonderful form even if they lost a game before the break and that was against Real Sociedad (in the la Liga) but I don't think that should be considered but facing some of the tough teams in the champions league they (Barcelona) haven't showed any form of relenting their pace to win the title, can we say they are one of the best to win the champions league?
Since being taken over by Hansi Flick, Barcelona performance has improved drastically, I personally will not talk about their performance in La Liga at the moment, because after all they are currently at the top of the table and only have madrid as the main rival, in contrast to what happened in the UCL where Barcelona has many strong rivals to become champions this season, currently their have a solid squad with a combination of talented and experienced young players, so their squad looks complex at the moment, and back to win patch after defeat to Monaco in UCL has shown that they are capacity of competing at the highest level with incredible bounce ability.
The competition in the UCL is very tight and teams that do not have a strong mentality will of course be very difficult to compete, but if we look at barcelona at the moment, of course they are one of the favorite teams to be able to win the UCL this season, but it can happen if they can continue to maintain their current performance, mentality and consistency especially when facing the challenge of big teams in the UCL.