I usually fly Bus. or PE on AirNZ but picked up some cheap non-upgradeable economy flights to Singapore. We are a family of 4, im 6ft my wife is 5'1 and we have 2 kids (3yrs and 5yrs). We had 2 skycouches on the way there each adult sharing it with a child. We both said never again. On the flight back we had 4 skycouches, 1 each and agreed it was better than PE.

So from my experience, my 2c is PE>Shared Skycouch & Own Skycouch>PE