I fly (ok, flied, until budget cut) 8-10 per year long haul flights - SIN-SFO, SIN-EWR, SIN-FRA as some examples. All my flights are in Y due to company travel policy.

I would like to know which airline is the best (from your point of view) to fly long hour in Economy from seat and overall comfort prospective. I am not particularly interested in meals or entertainment options.

Please note, we are talking about pure Economy, not Premium Economy class.

Thanks!