Interesting thread. I certainly agree with the ground services contention. I haven't flown AF in F, but the LH experience (either if FCT or a remote stand) is great. Bear in mind though, that if you're in an FCL in FRA and it's not a remote stand, you're walking to the gate, same as SQ in SIN.
I just flew the A380 SYD-SIN, and the 77WN SIN-HKG. Food was excellent, but I had BTC for the 2 big meals (lamb shank curry & nasi padang), and a special meal for the arrival refreshment on the first sector. My big criticism is the bed in the new F on the 77WN. SQ claim it's 82 inches long, but that's simply not true. It's possibly 74 inches at best. I know, because I'm 74.5 inches long, and I can't quite lie down straight end to end. It might be 82 inches along the diagonal, which is I guess how SQ expect taller people to sleep. Yet another fail from an SQ premium cabin for me, sadly.
The bed on the refreshed suites, on the other hand, is very comfortable, and plenty long enough.
Service - pretty much excellent on both sectors, but we were 12/12 and 8/8, and they did struggle to keep the pace up.