Arsenal seem more focused in their champions league games this season than in they focused in the Premier League. You know they've had two seasons of near success in their English Premier League race, and don't want to put much of hope their, whereas the joy that they're looking for could come from another side and in a bigger way, I'm currently not judging what Arsenal currently does in their EPL games after witnessing their incredible performance against Real Madrid at the Champions League, that shows they have more interest their since Liverpool are already at the verge of winning this season's trophy.
The only team in this semi-finals that is still doing well in their local league is Barcelona. They currently won the Copa del Rey after defeating Real Madrid. They are still maintaining their lead in La Liga. Inter Milan just lost the top position in the Seria A to Napoli after they lost against Roma. Arsenal just lost the Premiership to Liverpool when they drew against Crystal Palace. So, from all indications, almost all of these teams are placing more emphasis on the UCL.