Barcelona fans will certainly be happy their team is performing so well. Indeed Barcelona have been performing beyond expectations and now leading at the top of the league table ahead of Real Madrid. Barcelona look pumped up for the title race and as long as they remain consistent, it will be difficult for the other teams to overtake them.
In every match that Barcelona has played in La Liga, they have always been careful and worked hard to consistently win and this has been proven by the results Barcelona has obtained so far (19 wins - 1 defeat - 2 draws). This season's trophy will definitely belong to Barcelona and this is Xavi's first La Liga title as Barcelona coach.
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Robert Lewandowski is a killer, 15 goal

but the first one of Italian Scudetto, do 18 goals
Barcelona still has 15 more matches to go through, so the chance for Lewandowski to increase his number of goals will be huge and surely Lewandowski will make himself the top scorer in La Liga (btw, I think it is unethical to compare the top scores of players between leagues).