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Looks promising with Barcelona chance qualify to next phase based on group stage is not really get difficult opponent, has opportunities for Xavi Hernandez make Barcelona qualify to next round after failure in group stage last two season in a row. Not any bigger opponent teams will make Barcelona easily managed top standings in Group H and I think Barcelona has ratio above 80% for qualifying to next round in Champion League.
Porto, Shakhtar Donetsk and Royal Antwerp is not difficult opponent teams for Barcelona and actually they have chance for winning all matches in group stage.
Give beneficial in domestic league because Barcelona can all out for getting points in La Liga, but Champion League must priority after failure last two season qualify to next round.
One of the advantages for Barcelona this season is that they don't have super difficult opponents in the group stages, but that will never give them a guarantee of easily leading Group H or qualifying for the next phase. Porto and Shakhtar seem ready to accept the challenge of competition even though on their side it will be difficult to beat Barcelona, but I think they also have a chance to lock in a ticket to the last 16 phase.
Xavi has priorities in La Liga, Copa Del Rey and Champions League. Of course Barcelona has a chance, but something bad could still happen to them due to injury or other problems. Nevertheless I think everyone would agree that Barcelona can qualify for the last 16 this season although we cannot be sure how they will do it.