I imagine some say it's dead even, some might even give the edge to Clark. I say a speedster should edge out a Kryptonian most of the time, or "Fastest Man Alive" doesn't mean much. I don't think Barry should pull away from Clark that easily based on all the Super vs. Flash races I've seen where the outcome isn't certain, sometimes not even resolved. Maybe speedsters should be much faster instead of slightly faster, I just don't think they are/have been. Of course, nothing about Barry is normal Barry or even normal Flash so far, so why not, I guess.