Does BKK have priority customs/immigration for J passengers on SQ for arrivals?

Does BKK have priority customs/immigration for J passengers on SQ for arrivals? How useful is it if it exists?

You need to make sure you receive a Premium Lane card on-board... it can be a real time-saver – just two people in the Premium lane on my last visit versus what looked like 200 in the main line.

It definitely exists for Etihad pax in J, I would assume SQ has the same deal. It's way over on the right hand side. 

How useful? Slightly useful. In my experience the regular queues aren't that slow and the premium queues aren't that fast, so you're saving a matter of minutes. Perhaps there are times of day when it's really useful though. 

I have received Premium Lane Cards with CX, MH & QF so assume SQ should be no different.  Benefit really depends on the time of day you arrive, I usually arrive mid/late afternoon and been able to walk straight up to an officer, where the normal queues appear quite long.