In what world is a healthy Thiago Alcantara a better midfielder than a healthy Marchisio or Pjanic? Catalunha?
With Khedira, Marchisio and Pjanic healthy, that midfield is easily on par with Bayern's and only a slim downgrade from the spaniards. The problem is the healthy bit (or, in other words, the lack of adequate depth) and that's why Juventus' midfield is, in fact, not on par with these teams and would need (at least) another starter level player to compete.
Needless to say, Matuidi's lack of technical ability won't help bridging that gap.
On this subject, by the way, I'm amazed by the so often written 'he plays for PSG' argument when they actually never managed to go through CL quarters, even with the super team they have. Big factor indeed... in fact, I could be willing to bet they will go up a notch this season without Ibra (or rather the Ibra/Cavani duo that never worked against big teams) and Matuidi near the starting eleven plus Emery replacing Blanc.