OK folks, fwiw I did a little experimenting....(posted 9054 days ago)D3200 at EI 2000 in Ilford DD-X 1:4 and Kodak Xtol 1:1, each with the addition of 50g/L sodium sulfite.
The DD-X negs are significantly finer-grained and resolve slightly finer detail than the Xtol negs, which in comparison are sort of salt'n'pepper gritty. Without the sodium sulfite, DD-X negs are slightly grainier than Xtol negs. The Xtol negs show higher acutance.
Sodium sulfite had no discernible effect on D3200 in Xtol 1:1.
Odd and interesting. Your mileage may vary.