So Sentry with full conscious access to all his powers? Gotta go with him. WWH Hulk is really the only true low showing for Sentry. Given the description of his powers, all other below-Molecule Man showings could theoretically be ascribed to him not accessing his full power, rather than be part of some average.
He's like Infinity Gauntlet level, possibly. Maybe more.
We'll know more I hope and have answers to questions like this as more of the new Sentry comic comes out. Hopefully his powers will be properly defined at last.
Sentry is mentally ill and has days, which are worse than others. That's typical for people with certain mental illnesses. Sentrys bio states that when his mental states wavers, he becomes easier to defeat.
In comics we've also seen Sentry dealing with some serious issues and in fights underperforming. In WORLD WAR HULK he was so anxious, that he couldn't leave his house for few days. When he had no choice but to engage the fight, his power output wasn't as impressive as during other showings. His energies spread over a couple of city blocks.
In NEW AVENGERS during the 'Collective' storyline he was also anxious and unsure, but when Captain America called for him, Sentry entered the fight, took the opponent into space and as the side effect of their fight a nearby moon got destroyed.
In THUNDERBOLTS Sentry didn't seem to struggle all too much. He didn't want to fight Photon on Earth, because he knew it would devastate the planet. Photon then teleported them into the Microverse, where the two of them engaged. Their escaping energies were not only destroying planets, but they were visible in the regular plane of existence. And you have to keep in mind that in the Microverse atoms have the size of planets.
In UNCANNY AVENGERS Sentry was affected by the Death Seed, which unlocked his potential. He was performing at his -until then and until now- absolute best. His power and strength mirrored the combined power of over a 100 heroes (including power houses like Blue Marvel, Hyperion, Captain Britain, Hulk and so on).
So when we talk about a stable Sentry, we talk about someone, who would bitchslap the WORLD WAR HULK version of the Sentry into oblivion.