I flew SIA C-class last year from JFK-FRA and return on the upper deck and can tell you, service and food is far better than DL, SR, UA and LH.
The F/A are very attentive and friendly, the food was excellent, the entertainment "wiseman" is also state of the art. Singapore is just an excellent airline to fly on.
Seat pitch is 52"
The biggest for an airline with a three class config.
Seat width 21"
If you have a little more money fly their First Class.
That's what I did last year in July and it blew me away.
Simply amazing. I was like spending 8hrs in a five star hotel. Excellent!
"now more than ever a great way to fly"
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Photo © Vasco Garcia