I think you’re reading too much into the game against Juve. Juve aren’t at it, they’ve been very lucky in the two games with Sporting and look like they will make the last 16 now but they’re not playing well and are scraping by. They look much weaker at the back with the loss of Bonucci and up until the last few weeks Higuian has been really poor but is now coming back into form.
Only for the early season form of Dybala, Juve would be much further off the pace in Serie A. They’ve had a fair bit of upheavel in the summer so as things settle down I suspect they will improve but Barca hammering a struggling Juve in a group game is not a great metric.
There could be a few tasty draws there.
United will get one of Sevilla, Shakhtar or Porto in the last 16.