Photons To Photos just published their Read Noise in DNs versus ISO setting measurment of the Fujifilm X-H1.
Almost identical results to the other Fujiiflm X-Trans III cameras. Check them out here.
“The drop at ISO 800 is where dual conversion gain starts.This is a relatively common technology first proposed by Aptina in their DR-Pix Technology White Paper and was probably first used in the early Nikon 1 cameras. Dual conversion gain works by lowering Full Well Capacity (FWC) to improve read noise.Bec ause FWC is lower there is a minimum ISO setting at which you can apply the technique.”