I've flown LHR-LAX and HKG -LHR on Virgin 787-9 and HNL -AKL on ANZ 787-9. Compared to any aircraft I've flown on long haul over the last 55 years, (B707, B720, B747-100, 200, 400, B777-200, 300, DC10-30, A300, A330-200, 300 and A380), all in economy, the 787 wins hands down. The pressurisation/air conditioning certainly reduces fatigue, the windows are large and, even if the crew insist on darkening them in daylight, you can still see through them enabling you to keep awake when you need to keep awake to maintain circadian rhythm. The seats on both airlines were excellent on 11, 9 and 13 hour sectors respectively. Will be flying to New Zealand and back on Cathay A350s in a few months but the comparison will be skewed as I will be in Premium Economy.