What are all the friendly and enemy ultimate sounds?

Here are the voice lines for each character. First is the one you hear when an enemy uses it, followed by the one when an ally uses it, italicized (if they differ). With very few exceptions, the enemy-heard lines are much louder, to alert you.

Bastion: The "charge" fanfare, in his trademark beeps.

D.Va: "Nerf this!" "Activating self-destruct sequence!"

Genji: "Ry?jin no ken wo kurae!" "The dragon becomes me!"

Hanzo: "Ry? ga waga teki wo kurau!" "Let the dragon consume you!"

When using his Lone Wolf or Okami skins, Hanzo's lines instead become "Okami yo waga teki wo kurae!" and "The wolf hunts for its prey!"

Junkrat: "Fire in the hole!" "Ladies and gentlemen, start your engines!"

Lúcio: "Oh, let's break it down!" "Drop the beat!"

McCree: "It's high noon!" "Step right up."

Mei: "Dòng zhù! Bù x? z?u!" "Freeze! Don't move!"

Mercy: "Helden sterben nicht!" "Heroes never die!"

If using her Valkyrie or Sigurn skins, the allied line changes to "'Till Valhalla!". If using the Imp or Devil skins, it becomes "Heroes never die... for a price!"

Pharah: "Justice rains from above!" "Rocket barrage, incoming!"

Reaper: "Die, die, die!" "Clearing the area."

Reinhardt: "Hammer down!"

Roadhog: "Eat this!" *laughter*

Soldier: 76: "I've got you in my sights!" "Tactical visor activated!"

Symmetra: Symmetra does not have an enemy-heard line. However, if your allies notice enemies returning to the battle rapidly, or find or destroy the teleporter pad, they will shout to notify you of its existence. Her ally-heard line is "Teleporter online. I have opened the path."

Torbjörn: "MOLTEN CORE!!"

Tracer: Depending on how the bomb lands, one of these pairs of lines will play:

(when stuck to an enemy) "Gotcha!" "Right on target!"

(when missing an enemy, but close) "Here you go!" "Wait for it..."

(when not landing near enemies) "Time's up!" "Wait for it..."

Widowmaker: "Personne n'échappe à mon regard." "No one can hide from my sight!"

Widowmaker's lines are reversed in volume from the norm -- her enemies will find it very difficult to pick out the line unless they are practically on top of her, while her allies will be made very aware that she has used her visor.

Winston: *roaring*

Zarya: "????? ?? ??????????!" (roughly "Ogon po gotovnosti"*) "Fire at will!"

Zenyatta: "Pass into the Iris!" "Experience tranquility."

*According to a very dear friend of mine who studied abroad in Russia, this is actually incorrect; "?????" is the noun for an actual physical fire, not the verb for firing a weapon.