The consensus seems to be that Thor's greatest feat of pure physical strength occurred when he used a mystical fishing pole to break the Midgard Serpent's grip on Earth and lift its full weight off of the planet and into space. The serpent itself has the exact same weight as Earth which, being measured at 6.6 sextillion tons, is almost incalculably high. There seem to be, however, two important factors that are being overlooked that will make this feat, once discovered, even more impressive and hopefully end the longest running debate of is Thor or Hulk physically stronger?
Now it may seem to irrational to compare the constricting strength of a mystical creature like the Midgard Serpent to that of an Anaconda, but bear with me here. An Anaconda weighing 550 pounds was measured as exerting over 90 pounds per square inch of force during an act of constriction, this equals a total force of over 8,818 pounds, or roughly, 16 times its bodyweight.
Now when we factor in that the Midgard Serpent was in fact exerting an additional sixteen times its weight in resistance due to being coiled around the earth at the time Thor hoisted it off, that would mean that the God of Thunder exerted enough strength to break over 105.4 sextillion tons of force!
The second factor that is often overlooked is the positioning of Thor's body and the method he is using to lift. As an avid fisherman, I have experienced a vast difference in difficulty when using two different methods in removing fish from water. The first, being the easiest, is crouching down right at the water's surface and hoisting the fish out by it's mouth from a good mechanical position of leverage using the elbow joint and the powerful bicep muscle. The second, and far noticeably harder method is to merely hoist the fish out of the water with the pole itself; suddenly a five pound fish feels like it gains a hundred pounds! The further the weight is away from the center mass of your body; the harder it will be to lift; the fact that Thor had to lift this much weight by the end of a pole is virtually unfathomable. Imagine how much more force Thor could exert if he were acting in a natural plane of movement; say a pressing motion either horizontal or vertical?
The point here is that Thor's strength, at least in the moment he lifted the Serpent, should be placed on level with Superman and nowhere should the assertion ever try to be made that the Hulk has ever duplicated such an extraordinary feat of physical power from an awkward and disadvantaged position. A 150 billion ton mountain may be impressive, for a mortal, but there's a reason why the Hulk isn't and should never be on the level of an immortal being who is lifting in the sextillion range. Case closed.