Tek is a good keeper, but we never have had a keeper that could seriously save our defense with 5-7 amazing saves like Sommer did today.
Those were good saves but not amazing stuff. Sommer saw Yamal shooting at far post every time and acted accordingly. If any of those shots would have been a little more to his right Sommer wouldn't have saved them. The only time when Yamal shot at the near post he beat Sommer but unfortunately it hit the post.
When players did place the ball well, we scored. Same thing happened in PSG vs Arsenal. PSG placed their shots well and Raya couldn't do jack shit.
Tek's performance in Milan wasn't bad and it's not like he could save us from anything. Maybe the goal at near post for the 3-3 could be considered part his mistake. But again, ball was shot from small distance, with power and most importantly it was excellently placed.
Sommer was good because we made him look good. Shots that most GKs at that level should save.
If Barca would have won forum would have said that Tek's performance was clutch. At the end of the day both GKs saved what they could save and were beaten by good finishing. Sommer just looked better because his goal was bombarded all night and his team won.