DxO Mark and pentax lenses

Hello,

When I look att DxOMark and their tesst of pentax lenses. Pentax seems like a real lousy brand. None of their lenses are in the top 300. This seems a Little bit unfair I belive. For example the DA 300 is according to me a brilliant lens but according do DxO it sucks. Anothe example is 100 macro it gets real low scooring but when one looks at the Picture from this lens and hear what the owners of this lens has to say it is a very ggod lens. Why is iyt like this? It seems to me that every sigma lens scores very high at DxO and every pentax lens scores bad. In real Life most people seems to prefer Pentax original over Sigma.

Cheers

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kriztian