I guess nobody have both of cameras, or having privilege to use both. I'm still on progress with my silver donor status (having difficulty to use Paypal). Anyway maybe one can upload image from D100 and other upload from D1X, because what we want to examine is the grain/noise.
I use to shot Large Fine JPG using 1600 and getting satisfactory result. I'm just curious whether D1X is better.
Pinky Mirror Nikonians@Jakarta,Indonesia-- it's near Bali, if you don't know where it is
I've been taking some photos at ISO 1000 with my D-100 (an even higher) with nice results and a very acceptable grain. The H1 and H2 (3200-600) have a bigger level o noise, but you can compare with B/W negs with the same ISO rating.
_____________________________ Xavi, a Nikonian in Barcelona