highly doubtful.
here's my recollection of how people turn in different fields.
cat 5: people cutting the apex way too early and swings out and taking people on the outside
cat 4/5: serious slowing down in the corners, with a good dose of accordion afterwards
cat 3/4: pretty damn smooth most of the time. still a bit of accordion, but no one's touching the brakes
cat 1/2/3 (no personal experience): they take the same corners that the cat 3/4's take at about 1.5-2mph faster