I didn't think it would work as the Sony spec says "8G max". But maybe they meant the max config they sell?
I hunted around, and found two vendors who's "memory finder" claimed they had compatible 16GB cards, and further claimed they had a money back guarantee if they were in fact not compatible. So I took my chances. And... IT APPEARS TO WORK!
I've installed it, and the Control Panel and Task Manager both clearly confirm 16GB is in place. Some basic testing seems to show that it's working fine too. I'll post here again if I see any problems, but given these indicators, I think all is well!