As the 1st leg games of the semi-finals are concluded, here are the updated odds for the outright Champions League winner (by BC.Game):
PSG: x2.25
Barcelona: x3.5
Inter: x4.5
Arsenal: x8.0
So we have a bit strange situation, when Barcelona is no longer the favourite to win, but, at the same time, they are still the favourite to qualify to the final. This is either likely due to the bookies being impressed by PSG's performance or, most likely, because of PSG's chances of qualifying are higher than Barcelona's.
If we see the final between Barcelona and PSG, I'm sure Barcelona will be the favourite.
Odds for Arsenal are looking pretty attractive. Obviously I wouldn't recommend betting any significant amounts, but putting a few bucks on them could be worth it.