Actually, I have been to SQ Business Lounge (pre-Covid times, don't remember which terminal it was but I flew SIN-AKL on SQ J and this lounge was right next to the FC lounge) and it was big and spacious, with lots of armchairs, numerous shower cabins, had restrooms and good food variety. I'm not saying it was outstanding, but the lounge for *G at SIN where I was... there's no comparison.