Your 773 is the last one in the fleet. The others have been upgraded and one in shop being upgraded. This HS-TKE cabin is very very bad. It's OK to have old cabin but this last aircraft C cabin is not maintained well at all. Maybe TG maintenance is not stocking up parts for these seats anymore since it'll be gone in a few months.
You get from domestic gate to international gate in 25 minutes. That's not too bad. At FRA or LHR, for example, a walk can be very long depending on your arrival and departure gate.