I'd have to agree. Judging by this fight alone it seemed like Goku actually won, up until he knocked Superman into the sun. In the end, it came down to who could use the sun's power more efficiently. But at the same time, looking at Goku's maximum Ki output, that blast that knocked Superman to the sun probably wasn't enough to kill him; in which case, he would have been back in a few minutes since he was already in space and thus able to absorb solor rays.
It's still tough to call, but I do like this outcome. These guys did a great job at spelling out their data for us.
On another note though, this makes me wonder if Gigantic Exceed still has a chance at beating Goku as well. Though, I'm not going to try and calculate Exceed's data, LOL!