Why DxOmark claims are rubbish

DxO has been doing a lot of self promotion lately claiming this sensor is better than that sensor and blah blah.

Let's get something straight. DxO is not measuring sensor performance directly. It is measuring raw files constructed by the manufacturer. It then measures some quantitative characteristics that purportedly are proxies for image quality, which are tenuous at best. It then provides an arbitrarily weighted overall score. That score has little to do with the sensor itself notwithstanding its promotion of it as a "sensor score".

Ultimately, it is a score on how a manufacturer constructs its raw file. Therefore, NR applied across the whole range of iso will produce a very good noise score. This is irrespective of data integrity or whether there are false detail. That is why there are wide ranging scores for the exact same sensor. Acuity, micro contrast, data integrity, detail, resolution are deemed irrelevant for IQ according to DxO.

Because of DxO's constant self promotion, idiots out there think the IQ from a D800 is better than IQ from Phase One and Hassie.

These are lemmings that follow the piper off the cliff blindly.