I was thinking this through, since both athletes were/are 16 at the time. Quincy's time is the 23rd fastest time this year and looking as far back as 2001 it would be top 20 in the world and even top 3 in several years ranging 2001-2011. Sydney's 2016 Olympic qualifying time is a U18 record and was a U20 record too that she broke many times since. Her 54.15 is usually top 10 in the world each year and in the 10-15 range at worst as far back as 2001. I'd say that the men's 400m is deeper with a better talent pool but is that enough to make Quincy's performance better comparatively?