First, to find out what aircraft and routings Lufthansa use, you can check it out on their website: www.lufthansa.com
Just basically, they use B747-400's, a few 200's and A340-200's on their longhaul routes. On the medium and short haul routes you have the A300-600, A310-200, A319, A320, A321, 737-400, Canadair and AVRO RJ 85.
Frankfurt is the biggest and primary hub, however Munich is #2. There are several non-stop flights between Munich and a number of destinations in North America, Middle and Far East.
Having flown with Lufthansa recently from Frankfurt to Beijing and from Shanghai to Frankfurt, I can say that the service was quite good. Not Singapore Airlines style but very solid, the FA's were polite and courteous and the food was pretty good for airline food.
The seats were fairly comfortable (I flew economy) and you even have adjustable head rests on them. Pitch was pretty good and so was the legroom. Unfortunately, no PTV's. Hope this helps.