"Quantify" means to identify a quantitiy with a value. "A lot" is not a value. You can't put a value on how angry he is. You can, however, put a value on how much Hulk can lift at a particular point in time.
The madder Hulk is, the easier it is for him to get a strength increase. That better? Savage Hulk can't increase his strength without somehow loosening Banners control. The easiest way to do that (aside from having Jean Grey telepathically lobotomize Banner's persona,) is to get angry. The angrier Hulk is, the less control Banner has, and the easier it is for Hulk to get stronger.
Merged Hulk supporting the 150 billion ton mountain was not the most weight Hulk has ever lifted, and that feat alone further proves my point. The mountain fell on Hulk, and Hulk caught it on his back. Merged Hulk is nowhere near the 150 billion ton range, and as soon as the mountain landed on him, the physical stress and fear of being crushed made him strong enough to support it. Neither stress nor fear are as potent catalysts as anger. When Hulk started to weaken, Reed insulted him to make him angry. This made Hulk strong enough to support the mountain until Iron Man, the Human Torch, and Photon devised a way to escape.
The same is not true of Superman. Superman has no source of infinte yellow sunlight, and the source that he has he can draw from only gradually. Superman doesn't have limitless strength. He can keep getting stronger and stronger, but eventually, there will be no yellow sunlight to absorb.
Actually, the feat proves my point, demi. The level of anger Hulk is at does not directly correspond to his level of strength. Hulk has been way, way angrier than he was when he resisted the matter anti-matter attraction. However, proving to Spiderman that he was the strongest one there is required holding the shiny balls apart, no matter how hard it was. Savage Hulk can lift whatever Mindless Hulk can lift. He just has to be angry to do so.
What is also true about the matter-antimatter attraction feat is that Hulk would never experience a strength increase like that in a fight. Hulk's strength increased to near infinite levels at that because Hulk needed to. In a fight against Thor, Hulk just needs to get stronger than Thor, not strong enough to resist the matter-antimatter attraction. The feat just shows that there are no limits to the level of strength Hulk can attain.
Understand that there is a finite amount of energy in the universe. It wouldn't matter if Superman absorbed energy from cows. There is a limited amount of energy, period. There is no limitless amount of energy that can afford Superman limitless strength, regardless of how much he can absorb.
I'm not contradicting myself. The angrier Hulk is, the easier it is for him to gain a strength increase. When attempting to lift a massive weight, it doesn't matter exactly how mad Savage Hulk is. It may be more difficult for him to do so than say, Mindless Hulk, but as long as he's angry, he will be able to become strong enough to lift it.
Hulk resisting the matter-antimatter attraction doesn't show that his strength can become greater than infinity; there's no such thing. It shows that he can resist a force of infinte magnitude because he can continue increasing without ever stopping, like infinity, and that his strength isn't bound by the laws of physics.
The Beyonder probed Mindless Hulk and saw found a source of infinite power within him. Mindless Hulk was strong enough to wrestle the Beyonder, who also had* limitless strength, to a standstill.