I've owned the X Pro1, now own two X Pro2s. The X Pro2 viewfinder is a vast improvement. The refresh rate and the way information is displayed is much better. The camera is more responsive and the autofocus is in a completely different league.
Last week I used the X Pro2 professionally at a motorsport event, cars coming towards me at 100mph+ in misty conditions, not a single missed shot.
The X Pro2 is in a completely different league in every area.
If you liked the handling and form factor of the X Pro1 but didn't like the EVF then I think you'll love the X Pro2.