Of course there will be a big of pressure for Barcelona, by signing Lewandowski and other if doesn't win every game they will only be booed by the fans. At the end of the previous season this team has been very good and has become a hope, if the current team changes make down performance like the beginning of last season it will be not good, for the temporary board standings because current competition will be difficult. Anyway match be against Sociedad shouldn't be a big problem for Barcelona to get full points.
Barcelona shared the points in the first match. Barcelona should get full points against weaker teams from the start if they want to win the title. If not, Barcelona will be far behind in the fight for the title. Barcelona needs to get full points against Real Sociedad by any means. Otherwise, Barcelona will be 4-5 points behind Real Madrid.