showing stylish excellence:
he’s a class player
informal a person or thing displaying impressive and stylish excellence:
the writing and the look of the magazine make it a real class act
a class apart
much better than others of a similar kind:
his songs were definitely a class apart
in a class of its (or one's) own
unequalled, especially in excellence or performance:
British advertising is in a class of its own for inventiveness
So it depends on your view of a particular athletic performance. Ben Crawford's win the 1600m at the Bay Sheffield definitely was a class apart - "much better than others of a similar kind".
Was he showing stylish excellence? I guess it's up to the individual. There's no right or wrong answer.