I found the CX lounge to be much better than the JL lounge. CX is light and airy, and few people using it at the time before the JL flight. JL lounge on the other hand seemed very crowded, and a little dated. Food/drink selection also was not very impressive to make it worth staying there versus the CX lounge.
I second that. I always head to the CX lounge instead of the Sakura lounge at SFO. Unfortunately the Sakura lounge leaves a lot to be desired and is in dire need of an expansion and refresh.