>>3407048>they don't cheat on ISO at allOlympus has a much higher difference between the camera-reported ISO value and dxo's measurement method than other brands (Canikon and Sony have like 0.5 stops, Olympus has over 1 stop).
This is irrelevant in practice if you're only using one camera because ISO is an arbitrary scale, but sucks if you're trying to maintain consistency between several different cameras.