Are there any specific comic book writers or artists who's work had a significant influence on Quantumania?

It is hard to say for sure which specific writers and artists had the greatest influence, but comic book writers who have worked on Kang storylines like Kurt Busiek, Mark Waid, and Jonathan Hickman, are likely to have influenced the film. Artists who have illustrated the Quantum Realm, such as Jack Kirby, also likely informed the visual style of the movie.