Welcome to Michael's blog. Michael Andrew, (aka Michael The Maven) is a freelance producer, photography instructor, tech innovator, and when needed, disaster aid specialist. Disclaimer: Michael is a participant in Bhphoto & Amazon affiliate programs that provides an advertising commission if you purchase through links on this website.
I have published my buffer performance tests for the Fuji XT3 and the Sony A7iii:
My analysis on this is that the Sony A7iii has a deeper buffer and good pipeline speed, the bottleneck seems to be in the conversion to JPEG files. This is a processor speed thing. The Fuji X-T3 doesn't seem to have this problem.
FWIW- I have also tested the Fuji at 8FPS with Normal Compression and with those settings shot over 1000 images before I finally just gave up. I can't think of a setting where someone would need to do this, but the only other camera Ive seen this on is the Canon 1DXii.