Originally Posted by Zionite1
If he had a bored look it wld mean he wasnt even trying-hinting him to be far more powerful-thats dramatic.
A strained look lets us know he isnt as powerful as most other movies.
And... Now you're over thinking it.
Superman will have the most impressive power level of all.
That is drum roll please.... PLOC
Power Level Of Convenience.
That means if he lifts up a tank, he might show effort in doing so, or if he is going to push a small planet out of its orbit, he will show the same level of effort.
The mysterious power level is a direct result of the cosimic rays from Directors and writers who don't pay attention to, or even give much thought to Superman's power level, so they keep it vague as it needs to be for any given scene to work.
This is similar to scale in Transformers cartoons, this is size on convenience.