I have a Lufthansa Boeing 787-9 seat map ready now for upload. Preview below:
I have a few initial observations:
Seats 5A/5K have one window blank but the window that is present is well positioned.
In Premium Economy, the row pitch is not 38" - probably closer to 37"
In Economy the row pitch varies - for example, the port side (ABC) seats in the forward cabin and middle (DEG) seats in the rear cabin are slightly more tightly spaced than elsewhere.