DxOMark: Is the 75 1.8 the best m43 lens Available?

Such a claim isn't necessarily falsified by their statement. They up-size the results of μ43 lenses to 135mm format. If images from FF lenses were being up-sized to twice their original size, how would they do?

That is to say, it isn't that μ43 lenses are sharper than FF lenses is a myth, it's that the claim is true ​only​ in an incredibly narrow sense and one that is in many ways very much irrelevant to the final photo. It's the difference between lines per picture height and lines per millimeter. The fact of the matter is that FF lenses don't need to resolve as many lines per millimeter to still have more resolution than μ43 lenses in terms of lines per picture height simply because FF sensors have more millimeters available.

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--Mike