Just did this in Jan SFO-FRA-FLR with a hour connection. Our flight was on time - in fact, maybe a few minutes early. We walked quickly - stopped for coffee which ended up being useless because we had to clear security again and so had to dump most of it! We made it with a little time to spare. We weren't the last people on the connecting LH flight - it was about 3/4 full when we boarded.
As said earlier, it is good to know your options if you miss the connection.