For some bizarre reason JL seems to have deployed some domestic/junior crews on their new A350 routes - apparently they had prioritised fleet commonality over seniority, so those that used to fly A350-900 domestically are being deployed on A350-1000 on these flagship international routes, even in J/F cabins. This is especially obvious when you look at the age of the FAs, and those whom I've talked to all told me only a few months ago they were flying exclusively on domestic routes only.
Not that this is guaranteed for inferior service, but interesting to note nonetheless.