Inazuma got a reaction from
Adam Woodhouse in Is it just me or the lowish light files are too noisy?
Just registered on this forum to give my thoughts on this. Well not really my thoughts but my evidence.
https://www.dpreview.com/reviews/image-comparison/fullscreen?attr18=lowlight&attr13_0=sony_a6300&attr13_1=fujifilm_xt1&attr13_2=fujifilm_xt2&attr13_3=nikon_d5500&attr15_0=raw&attr15_1=raw&attr15_2=raw&attr15_3=raw&attr16_0=6400&attr16_1=6400&attr16_2=6400&attr16_3=6400&attr171_0=off&normalization=full&widget=1&x=0.345942857142857&y=-0.08956372968349002
On that page you can clearly see the X-T2 has a similar amount of noise to the X-T1, maybe a little better, whilst presenting a good deal more detail.
I previously had the Sony a6300 which I was OK with shooting at ISO 12800. So it surprises me that the X-T2 is actually even better.