Most probably at least half of them will hit 1PB limit if there is no controller failure. The problem is to find out how usable are after this mark. That would mean keeping them in storage for 3-6 months and check if data is still there. But if doing so, we would only know that the drives are capable of at least 1PB writes, without knowing any upper limit.
And if I would bet, my money in the 1PB race are on Samsung model... I only need to wait another 78-80 days (less time, less chance of total failure)