Lol... Speculations keep being presented as if they were facts.
1. Superman has been estimated to be close to the speed of light.
- There are several instances which indicate he is nowhere near light speed. Maybe its due to PIS, maybe not.
2. Superman Flying through a blackhole.
- Purely speculation on some very weak and ambiguous evidence, if any.
3. Neo is only Mach 3 - 4.
- Neo has been confirmed to be at least mach 3-4 in one instance. He has other feats to suggest he can fly much quicker.
. . .
As for the topic at hand, No man that can have blood drawn from him by a mere sword strike can stand up against the Man of Steel.
It wouldn't be much of a fight at all.