I guarantee that if Wonder Woman would fight Captain Marvel, she wouldn't lose - you can see War of the Gods, as an example. Or current Flaspoint Universe, where Wonder Woman fracked him up good, and where they'll likely fight again in the following issues.
We can look at how Superboy Prime physically compares with Black Adam, and we can look at how Superman does. We can look at how Martian Manhunter compares to Superman, and then look at how Black Adam does. We can look at how Jay Garrick compares to Black Adam, and how Superman does. We can look at how Wonder Woman compares to Captain Marvel, and then we'll compare how Superman compares with Wonder Woman. Since you seem to be so keen on taking Superman's word at face value, we'll see how he thinks that Wonder Woman and Captain Marvel's striking power compares.
More comparisons involving Superman? Let's look at how they compare when it comes to speed.
„In the blink of even your eye, I can be in the center of Metropolis”.
http://i738.photobucket.com/albums/xx28/PhilosophiaKMC/blinkofcmeye.jpg
Let's see how an amped Captain Marvel (Hercules and Atlas), who surely given that he is stronger than normal and going against pre-Loeb's massive upgrade/Byrne Superman, can overwhelm him in arm-wrestling, no?
http://i738.photobucket.com/albums/xx28/PhilosophiaKMC/CMArmWrestle1.jpg
http://i738.photobucket.com/albums/xx28/PhilosophiaKMC/CMArmWrestle2.jpg
Or not.
Eclipso Superman is not all-out Superman. Mind-controlled Superman is not all-out Superman. A few direct comparisons where Superman gives him props isn't enough to say that Captain Marvel equals an all-out, OWAW mindset or Darkseid confronting Superman. Superman is the king of verbal props to other characters, but when shit goes down, he's the one that's owning the opposition and plowing through attacks, while the ones who got the props are in the fetus position.