My wife and I flew MCO-FRA on Lufthansa A340 in Business recently.
The service was excellent throughout, food and drink very good. The cabin is very quiet, being so far forward of the engines helps.
We were in row 7, so I can’t comment on other rows.
The seats can be reclined in a myriad of ways. There is a gentle massage function included in the seat. I had no difficulty getting comfortable during the flight for reading or relaxing.
However, sleeping was not so easy. Despite the lie flat function, there is still an angle, and neither my wife nor I could get really comfortable for sleeping.
Hope this helps, Swissdiver.