Reason I asked this is I remember they were fairly even on an episode of JLU. I think Flash was able to avoid Sinestro's attacks cause he could think at near Speed of Light where Sinestro couldn't. How would this happen with the Comic version?
I see @nickthedevil as a good judge of who should win here
Thank you for the vote of confidence on the subject.
At the time of this thread's creation, I'd have said Wally would destroy Sinestro.
Currently, we don't know how fully powerful Sinestro is with Parallax, but I'd still want to say that Wally would beat Sinestro.
New-52 Barry Allen does not have those feats to contend with Parallax.