Thanks for the nice review of the GR iii x.
If it is helpful I discovered some additional differences with the GRiii
1. The histogram is now always visible on the 3X. On the 3 only visible with half press of the shutter
2. UHS ii cards do not work, at least not the Sony Tough series. They're supposed to be backward compatible but the 3X doesn't like them, at least not the Sony.
3. I suppose it is obvious, but just in case it's not, the snap mode is far less useful because of the narrower depth of field. At anything below an aperture of f8 there is a high chance of out of focus images
Otherwise a wonderful and competent little camera and a great addition to the 28mm equivalent GRiii