I've done the Wing, the VS Clubhouse and the LH FC Lounge (not the Terminal though). I was very disappointed with the Wing, thought it nothing special, adored the Clubhouse and thought the LH FC Lounge fantastic.

So my ordering of those three are
1) VS Clubhouse - there are a lot of things it has that other lounges don't, but it's the spa set up, complete with large shower/steam rooms for your own private use (not the pokey things in T5) and the jacuzzi/whirlpool which really set it apart
2) LH FCL - fantastic service, great range of drinks and great showers.
3) Concorde Room T5 - great dining options. The rest of it is good but not fantastic.
4) Wing, HKG.

Haven't done SYD or SIN.