I'm not even that comfortable in AirNZ's 777 premium economy. Obviously it's significantly better than economy, but if you have long legs you end up with very limited room for your feet. Of course if you do have long legs you probably have large feet.
On what plane? I love the Spaceseat on the 77W but it's a highly polarising product with basically 50% of people loving it and 50% hating it.
I haven't flown PE on the 77R refit (I've only flown on it pre refit) or 789 yet as I've always skipped past PE. I do have a flight to HKG in PE on the 77R next month to try it out.
I have similar long leg issues with the Spaceseat on the 777. Flew to LA recently and whilst it was way better than economy I had to sleep at an interesting angle.
The bulkhead PE seats on the 77R and 787 are also problematic, but the rest of the PE 77R and 787 seats are awesome.