I have a feeling that it's going to be a long time before I get my hands on a unit to review. In fact, outside of my usual circle of technology show journalists, I don't know anyone personally who has used the new camera. So I'm stuck piecing together a general picture of it's imaging capabilities based on samples from others.
This particular image was shot by photographer, Daniel Jannes who has generously made images from a test shoot available for download. I haven't been particularly happy with most images from others....too many with focus, lighting or post processing issues.
RAW CONVERTER EX 2.0 powered by Silkypix
Important: Even though the GFX 50s is based on a Bayer sensor, Adobe Lightroom CC does "ONLY" a decent job of rendering a high quality preview but some areas were slightly muddy. So, I imported the file in RAW CONVERTER EX 2.0 Powered by Silkypix which Fujifilm provides at no charge. You can download it directly from their website. Immediately there was a difference with a bit more...pop. Add the "Natural Fine" sharpening setting and all those wonderful details jump off the screen at you. It was far better and the transition between light/dark areas were smooth.
Full Sized File at 8256X6192
If you are a regular Fujifilm X-TRANS user this image won't seem much different from your standard X-Pro2/X-T2 file...except for the large increase in resolution and a bit lower noise at BASE ISO. That's good news...
I've made only one adjustment to the file for the conversion to JPEG, and that's sharpening (Natural Fine). Everything else was left "As Shot" by the photographer.
There is an abundance of detail in the image for a good retoucher to work with and the resolution bump provides a great deal of latitude for cropping (for composition) while still having enough for prints on the larger side.