Response to Neopan 1600 in PMK?

Fuji's published curves for Neopan 400 and 1600 look almost identical to me. There's certainly not 2 stops difference between them. Both films begin to toe at just under 10^-3 lux-seconds, by Fuji's own data, so I don't think that '1600' (cough, cough!) will give you any more noticeable shadow detail than 400.
Ilford Delta 3200 and Kodak T-Max 3200 are both genuinely faster than 400 ISO, perhaps giving a real 1200 ISO speed.

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