He has about a 1:1 ratio between impressive saves and serious errors. Similar level to Ter Stegen, I'd say.
Nope
Ter Stegen was 1:1 in the league maybe but in CL it was like 1:10
Also, that's not true for Tek but I understand. What some people perceive a simple save, like those he collected against Benfica is a result of great positioning, concentration and reading of the game - something Ter Stegen severely lacks and most those shots he would place himself somewhere else and freeze while watching the ball go in
Not to speak of those simple crosses he intercepts which Ter Stegen would be watching scared to go at them
Tek is nothing spectacular, just a good goalkeeper but he's still miles clear of Ter Stegen who is a mediocre goalkeeper