IMO this Willian is better then the Willian at Shaktar. This season he is showing the attacking threat and creativity he showed at Shaktar (Playing against better opponents this time around) but also has the same insane workrate that he developed at Chelsea. Also, he has shown more grit and the ability to take a game by the scruff of the neck the same way he did for them.
The problem with William was always his decisiveness and his final ball. His build up work, link up play and work rate were always the best in the team. This season he has added a better final ball to his game and shown more confidence in getting forward to affect the final third. Something he was reluctant to do so much last season. Probably the one shining light from this season so far.