A small surprise:
In September I took a walk with the dp1m & dp3m, and I obviously took some shot.
I found a frog on a dark wall, iso 800, 1/60s and I take some shot, nothing of interesting.
I looked jpgs only and found them too noisy and washed. (thank to sigma photo pro speed)
I did some tests at 800-1600 only with fluorescent light, and those photo are useless.
This evening I opened raw files, I found decent: color are not vivid as at low iso but still decent, noise is not annoying, detail is terrific as usual.
I'm quite surprised that dp3m is decent at 800iso in daylight.