I am sure Arsenal players are not thinking about past as their current performance and quality is amazing and with this level of game they can change the history which is now into their hands with they needed confidence and better depth for beating team like Bayern Munich which is also not at the level which was they had in past due to transition period even they are going to give their best in this match as this is only chance for them to have any trophy after losing their all chances in Bundesliga.
Mikel Arteta is doing good job and his strategy is having good results for him which are clearly indicating they are on verge of changing history and going to have their best in this event after decades of bad results, Arsenal is now clearly looking for the success in all events.
Arsenal's performance is extraordinary this season, they have improved quite drastically compared to last season, I agree with that but we also have to look at it as a whole, their good performance is only in the domestic league, in the Champions League match they are not that strong, an example of this is the match round of 16 against Porto, they escaped with great difficulty and a little luck.
I see that Arsenal's problem is that they don't have a strong mentality/confidence when playing against top teams and that is the opposite of Bayern Munich.
If you look at the performance of the two teams, there will probably be a pretty fierce match between Arsenal and Bayern Munich, but I think that Bayern Munich's percentage of qualifying is greater than Arsenal's.