I'm personally not a fan of Fujinon lenses in general, zoom lenses in particular although there are a few good (expensive) ones out there and this image does not look sharp to me. .No offence intended - just my opinion. Any teleconverter will also degrade sharpness and your image is a good example of this. I use a Canon EF400 f5.6 (on my X-T4) with the K&F EF-FX adapter at a total combined cost of approximately £600 GBP and obtain results better than this..pse see attached.
