Flash is moving at such an insane speed that it looks like he’s actually warping reality – he recreates the town Superman is in to look like Krypton, not only the costumations, but entire buildings and landscapes (imagine that besides building all of those – he actually has to get all the materials from other locations around the world).
Superman tracks him down and proceeds to match his speed and catch him.
http://i1093.photobucket.com/albums/i436/KMCPhilosophia/supermanbarrywarping2.jpg
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“Always wondered..which of us…was fastest.” (note that this takes place after Flash Rebirth; also note that he says fastest not faster which denotes the fact that Superman considers that they are the two fastest heroes by default).
After stopping at a coffee shop, they have a lengthy conversation for pages in which they even use flashbacks while seemingly time stops around them with Superman again matching Flash’s level of perception/speed.
http://i1093.photobucket.com/albums/i436/KMCPhilosophia/supesbarrytimestop1.jpg
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What is Flash’s level of perception and speed – well, it’s good you asked because in the same issue, he makes it quite clear.
http://i1093.photobucket.com/albums/i436/KMCPhilosophia/FlashPerception.jpg
“I can perceive events that last for less than an attosecond”
Two things to clear up.
In case some of you interpret that “speed up my senses” scan as Superman needing to activate his superspeed, here’s what the writer of this issue had to say, while also confirming Superman’s attosecond-level perception.
It's a fair question, to be sure. I wasn't thinking of
Superman "activating" his superspeed perceptions, like
it was a light switch that could be turned on and off, so
much as it was shifting his perceptions to bring
superspeed events and sounds into focus. Like the
human eye looking at something small and close up
and then adjusting when the viewer looks at something
large and far away, I think Superman is perceiving all
of these things, ALL of the time, and it's just a question
of what he chooses to focus on. But I think Superman
is also capable of focusing on macro-scale, "normal"
speed events at a rate something similar to that in the
typical human range, so that he wouldn't spend a
subjective eternity between each word in every
sentence that Lois says to him. Similarly, he can chose
to perceive visual information much like we do, or he
can expand his perceptions and see far into the
electromagnetic spectrum, or narrow his focus far
enough to see individual atoms. But just like he
doesn't see Lois as merely a cloud of electrons,
neutrons, and protons, he doesn't perceive every
second as composed of a huge number of attosecond-
scale events--unless he wants to, of course.
But that's just one fan's opinion, too!
Best,
Chris Roberson