Superman has used his heat vision against other energy beams, both concussive and heat-based. Kryptonian eyes are just so all purpose :)
I like to think of it like this - if the thing opposing the heat vision is able to withstand the intense heat (and he's able to control how much heat it's giving off), it still will have to contend with the concussive force that the heat vision is dealing out. Most of the times, it's a non-issue, since Superman's heat vision is capable of being hotter than the core of the Sun. It's just an extremely devastating power he has. And I've read where he's used it against Green Lantern energy, other energy beams, other heat vision beams, etc.
Basically, Scott's optic beams would have no chance against Superman's heat vision. Either Cyclops would get incinerated, or the heat vision would be able to beat back the optic blast. The optic blasts may be a very effective weapon, but Superman (and Supergirl and Power Girl, for that matter) have been shown to be capable of withstanding supernova explosions, nuclear bombs, the core of the Sun, and the gravitational forces of a black hole or a neutron star. Scott, on the other hand, is still only a mutant with no invulnerability to anything (except for his own optic blasts, and I think havok's blasts if I'm not mistaken). So even if they passed through each other (which I don't think they would) one would hit and do no damage to the Kryptonian, whereas the other would hit and incinerate the mutant (or maybe knock him down if Superman is using a really low amount of heat.
http://www.youtube.com/watch?v=uiZ8gNC_2zU
Just using that as an example of using heat vision for its concussive force in addition to heat. I could find a bunch of comic book ones as well, but it's rare you see video which makes the point as well :)
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