As someone who’s worked at Marvel off and on for two decades, has spent the last five years working with the writer of the first reboot of squadron supreme, and is basically as entrenched in comic nerddom as anyone, if thinking of Sentry as Marvel’s Superman helps you get into reading about Sentry, then great, especially if you have no idea who Hyperion is. Check out the original series by Paul Jenkins and Jae Lee, and if you like the writing and art, check out The Inhumans by the same team.