Yes, even though West Ham looks good, Barcelona's quality is still better. Perhaps the peak was when Xavi managed to give victory in yesterday's El Clásico, this victory certainly boosted the morale of the players even higher and it was very important to make Barcelona more consistent. It's a great achievement for Barcelona themselves despite only being in the Europa League, because they can make improvements not only in one tournament but Xavi can really deliver good results in La Liga and here in the Europa League at the same time.
You're right, the improved form has given Barcelona more hope of winning the Europa League title this season. The condition of the Barcelona dressing room is now much livelier than the previous few seasons, it is the manager's greatest success where it has had a good impact on the appearance of his team.
I'm really following Barcelona's progress now even though they seem to be lacking in some areas. Some additional players next season will be very useful to keep the team's performance more stable, especially in defense. Pique and Alba can't be expected to play 90 minutes throughout the season, neither can some of the other senior players. So there must be a suitable replacement for them. But I think this season they will do well in Europe.