Bonus, I had a slightly different experience with the check in with Lufthansa now in August on our flight to Joburg. Because our flight from Munich to Frankfurt was in actual fact a high speed train, we had to check in online 24 hours prior and print our boarding passes as that is our train ticket as well. So fo the return flight I wanted to have specific seats and when you check online, there was still many options available. So I had not had the problem that our family was split up and we could sort out our seats without paying extra.
What I can say is that the seats on the Lufthansa 747-8 is not much to write home about. Man it was small. Our return flight was on Swiss (which is also part of the Lufthansa Group) and it is chalk and cheese I am telling you. The old A340 were newly refurbished two years ago and that cabin and seats is 10x better than the 747.