As mentioned in the comments, Hanzo's wallhack is answered in [this question][1]. As for Widowmaker, it is possible to hear her say "Personne n'échappe à mon regard", which is French for "No one can hide from my sight", but it's very quiet compared to other ultimates like Barrage, Tactical Visor, or Rip-Tire.


  [1]: https://gaming.stackexchange.com/questions/266782/does-the-enemy-see-hanzos-sonar