Yes Arsenal are indeed experiencing an improving season, if last season they were not so consistent until the end of the season, this season they are better and they can learn from their weaknesses last season which made them ultimately fail to compete until the end of the season.
as I said before, they need a win in the first leg so they can be more comfortable when they compete in the second leg. That is an initial task that they must complete well, and if they succeed in doing so, then their next task only needs to be to achieve a draw when competing at home to Bayern Munich.
Nothing is impossible, especially as they seem to have learned a lot from what they experienced last season, because last season they were inconsistent and the depth of their squad was not enough to cover when several of their main players were injured. Indeed, a club must be able to learn from their previous weaknesses if they want to improve even better.
In terms of quality, Arsenal this season has improved a lot compared to the previous season and because of what happened in the past with Bayern, it is possible that it will not happen again this season.
And Bayern is also not as strong as the previous season, so there are differences between these two teams at the moment, so the quarter-final match between the two will be fierce and both teams still have the same chance of winning the match.