How reliable are ranked stats?

According to statistics i have a higher cs per minute on vel'koz than challenger players or any division by at least .7, now i don't deny my last hitting is pretty fkin developed on my one trick champion but i'm recultant to believe i'm that good yno. Also my kda is 1 greater than challenger players. Could be explained by them not being one tricks or it could be explained by the competition being a lot more fierce or it could be explained by my highly calculated build choices that i see no other vel'koz players going for. Let me know what you think. Are your stats greater than challenger players?
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