Without conducting any scientific tests but shooting many rolls in concert and club situations, I compared Delta 400 pushed to 800 and 1600 with Delta 3200 pulled to 1600 and 800. Developing both in XTOL 1:1, I found the Delta 400 pushed to be noticeably superior in grain, and overall tonal gradation than D3200 pulled. I was quite surprised at the results, especially at 1600!(posted 8244 days ago)