According to http://www.dpreview.com/previews/fujifilm-x-t10/5, showing two shots of the same scene:
- XT-1 JPEG is 5.6MB
- XT-10 JPEG is 9.2MB
Using ImageMagick identify -verbose command on both original files:
- XT-1 JPEG has Quality 97
- XT-10 JPEG has Quality 99
Comparing visually the two scenes, it is quite obvious XT-10 image has more details (check the text part ie.).
I'm pretty sure XT-1 will have this in firmware 4.0.