A new answer on Who gets Bitcoin transaction fees? has spawned discussion on the paradigm shift from selection by priority
(= coin age × spent value) to selection by fee rate `(= fee / transaction size).
It's clear that Bitcoin Core v0.12.0 has turned selection by priority off by default, but I am wondering whether it follows that all miners have discontinued using it.
Is it known whether any miners are still selecting the transactions to go into their blocks using selection by priority?