@kingant27: No, I was simply saying that Superman and Doomsday are similar in the sense that they excel at withstanding physical-force, as opposed to different means of attack such as telepathy and magic(their resiliency against the latter two is lacking, or poorly defined in contrast).
So I don't see Captain-Marvel's 'magic' playing any less of a factor here, though Doomsday's generally portrayed as Superman's physical superior anyway(except speed-wise), and Captain-Marvel hasn't the feats to suggest he'd take a majority against a serious Superman.
Billy doesn't have the magic advantage, which he would have against Superman
I believe for all intent and purpose, he does. Superman isn't particularly weak to magic, just not exceptionally resilient against it(as well as telepathy, and many other forms of attack). Same/similar as Doomsday, I imagine.
@thanofleeze: I've been hoping to be enlightened a bit in that regard myself. I remember he was said to be "powerful enough to crack a planet in half with a thought"(or something of that nature, during Rebirth), and taking on a very large group of Green-Lanterns while missing a hand(and overpowering them while holding back, if I recall). But I'm not clear on the circumstances.