Yes, FRA usually has the newer seating in First/Biz.
THAI uses the FRA Senator Lounge for First pax on *A flights other than LH. Its is OK, but *G Y pax also can use this lounge and is nothing special (in regards as being different much from usual biz lounges) IMHO.
There are detailed reports and discussions, and I highly recommend teh search function to answer most of your queries, and then suggest you pose the 'leftovers'.
Cheers, TK