Ehh...based on this experience on the 787, I wouldn't be willing to pay a ton extra for it.   It didn't compare favorably to DeltaOne on any of the key elements.  However, it's possible the new A350 business class will elevate the experience more, and I'd love to try it.  On the 787, I'd maybe upgrade with points or a few hundred dollars, but would not pay thousands for AirFrance business class.