I've just completed my trip. Everything went smoothly.
MUC - ICN flight on A350 was very pleasant as I didn't have any neighbor next to my window seat.
ICN - FRA on B747-8 was even more pleasant as I managed to get a seat in F (without any additional charge or e-voucher). Unfortunately, it was only a semi-F class as no first class catering and other forms of F soft product were offered. Nevertheless, spending almost 13 hours in F seat, which is really very comfortable, was a pleasure. IFE in LH F in B747-8 is archaic though