The adoption of a EVF makes a lot of sense. One of the main issues of small sensor compacts like this was the usefulness of the optical viewfinder.
Regardless of the make or model, the viewfinder was small and coverage was restricted to around 70-percent of the field of view. The new P7800 address that and has very good image performance for this type of sensor. But, it can’t compete the Sony RX100 II with its 1-inch type sensor for image quality.
The downside for the Sony is that a larger sensor requires larger lenses, and the zoom range is limited as a result. Be that as it may, the P7800 is a step up from the P7700 and a compelling option for anyone that requires those specific capabilities.