X-Men 3 will have Dark Phoenix. That tips the scales against Superman cruising to victory.
If Supes flies back in time, he has the FF on his tail in Reed's just-finished Fantasticar to knock Kal-El's ship from crashing into Earth.
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"I'm not smart so much as I am not dumb." - Harlan Ellison
For you to say that means one thing .....you NEVER watched any of the Superman movies (starring Christopher Reeves).
There is no comparison .....movie Superman wins.
First of all XM3 is still in the future, and moreover it is still to be seen just how powerful the Phoenix will be in XM3. Going on the other movie depictions she/it will be much much weaker than the comicbook variant.
Most probably she will be made into a far more powerful movie Jean Grey, and thus although very powerful (especially by the X-men movie standards) is still nowhere close to the planet-destroying comic book depiction of the Phoenix.
However the Reeves Superman was basically written, and portrayed, as Pre-Crisis Superman.
Thus when it comes to MOVIE variations Superman still takes this.
Well, we shall see in four months from now. There are some who think Professor X can be a challenge for Superman; man can freeze and rewrite minds. In X2, Jean took control of Prof X and had him speaking her words - that was just for openers.
And by the way, it's Reeve. Not Reeves.
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"I'm not smart so much as I am not dumb." - Harlan Ellison
It seemed more to me like she was basically talking to him and he simply repeated it.
Anyway, Superman takes it with relative ease. None of those guys combined stand a chance against Silver Age Superman (I say Silver Age cause that's much more specific than Pre-Crisis).