DXOMARK.com, did you notice

Started Jan 28, 2014 | Discussions thread
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Anders W
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Re: DXO scores are like MTF charts
In reply to DonSC, Jan 28, 2014

DonSC wrote:

in that they're mostly useful for comparing similar things. For MTF charts you can't use the charts across companies. For DXO scores you have to use the same size sensor.

The DxO scores are meant (by DxO) to be comparable across sensor sizes. Whether they actually accomplish that is another matter.

For example, with sensors are of different sizes, where do you stand? To give equivalent FOV you need to stand further away with the smaller sensor. But that's a disadvantage. If you stand at the same spot with different FOV then the larger sensor camera is at a disadvantage. There simply isn't any perfect way to make the comparison.

There is no problem with that. You should simply compare lenses with the same AoV, e.g., 12 mm for MFT versus 24 mm for FF.

I think they try their best. It's just not that easy.

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