A fairly straightforward question: where do Heimdall's abilities come from?
It seems most Asgardians have a standard set of superhuman capabilities (strength, toughness, longevity, etc), and those who have additional abilities gained them either through learning skills (like Loki) or by using items (like Thor).
But Heimdall's infinitely-perceptive and infinitely-comprehending sight seems god-like, even among Asgardians. He is apparently quite unique, and the other Asgardians treat him with overwhelming respect and deference. Even Superman needs to concentrate when he listens to whispers from all over Earth, while Heimdall just casually glances across galaxies, maybe even universes, and can instantly find and understand the condition of anyone he chooses.
The closest I've found to an answer is this line from Wikipedia:
He is the all-seeing and all-hearing guardian sentry of Asgard who stands on the rainbow bridge Bifröst to watch for any attacks to Asgard. He partly won the role through using his eyesight to see an army of giants several days' march from Asgard, allowing them to be defeated before they reached Asgard, and making their king a prisoner.
...which indicates he had his sight (or a version of it) before he became the sentry, but it doesn't say where it came from before that.
Do we know how Heimdall gained this incredible ability, in any universe/medium? And if it was innate, is there any explanation for why he would have such a colossal gift, while all other Asgardians seem cut from more of a similar mold?