I finally flew CX's new J-class (on a 777).

It was nice, but I think SQ's long-haul J still wins on the following
* bigger seats - yes those brown extra-wide leather seats are awesome. I can sit with my legs crossed.
* food and wine - food was honestly similar to AA's (INTL flights only..). In fact at least in AA I'm always very full.
* the screen is not in my face and doesn't have to be stowed on take off and landing

Cathay wins on
* The triangular desk-like space is useful as I can work and dine at the same time

SQ's service is very professional, while Cathay's is a mix between AA's sometimes chummy FA's and SQ's professional ones.

I enjoyed it and would probably fly CX long-haul again given the price diff compared to SQ.