I think that when it comes to crafting historical moments in comic book history, no other franchise has given us so many masterpieces than the x-men
I’ll start with 3 groundbreaking moments in terms of storytelling aesthetics:
Uncanny x-men 17: having such an intense battle happening in the astral plane between xavier and the shadow king with charles and Amahl discreetly and discretely siting just across each other in a restaurant.
New x-men 121: the textless issue with jean and emma exploring xavier’s mindscape was so unique. It told us a clear, complete adventure without any narration nor dialogues.
Uncanny x-force 1 to 4: the final pages had few to none words from the members after fantomex killed the child apocalipse. No words yet the sentiment of the team was devastating. the art, the tones, the face expressions gave us the perfect comprehension of their conflicts and depressing inner struggles.