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Their analysys boils down to two factors: The MKH 8070 is 1) "Slightly more sensitive" than the NTG8 and 2) has "significantly better off-axis rejection". The sensitivity values of -20 dB vs -19 dB are virtually identical.
For off-axis rejection the following plot compares the two microphones at 500 Hz, 1000 Hz, and 4000 Hz. It should be very clear that the NTG8 shows superior off-axis rejection at ALL frequencies.

The NTG8 is 22" long and the MKH 8070 is 18", physics alone suggests the NTG8 will have a narrower field of view, the above plot shows this to be so. The Acoustic Nature conclusion is not just misleading, it is blatantly false. You can decide for yourself why they did this, I have drawn my own conclusion.
KJS 04/2025