Originally posted by Emacs Did I missed something? When properly done ISO100 (200, 400,800) became worse than 1600, 3200, etc?
No, you didn't miss anything, it was more your interpretation of my comment. Note that my comment relates to the K10D and X-Pro1 cameras as a whole. Sure, low ISO performance comparisons these days are a moot point, pretty much like the megapickles argument, which is why I'm not surprised that stevebrot isn't particularly impressed with the X-Pro1 performance from the particular samples posted up. What I'm saying, and what stevebrot agrees with just above, is that the K10D does have its limits, higher ISOs being one of them, and with regards to this parameter, as stevebrot says, "the Fuji should clean house on my K10D"
Originally posted by Emacs I always thought such a high iso is rather the last hope to take a shot than something that helps you to take a great picture.
Sometimes it's not mutually exclusive, and high ISO is the last hope that helps take a usable picture. Case in point, a theater shoot I did for a client early last year, where I was shooting at ~1/50th, f/2.8 and ISO3200 for most of the evening with a 70-200/2.8 on my K-7. Imagine if I was using an K10D, where i would be very reluctant to shoot with anything above ISO800. Shooting at ISO800 would have meant shooting at ~1/13th and f/2.8. Even with the help of IS, the focal lengths involved, and moving actors would've meant the chances of getting usable shots would have been very, very low. Not impossible, I must say, but it would have been very very difficult.
Of course, we do digress and this is a thread about the X-Pro1, of which I'm quite looking forward to receiving mine. Will it replace my 2x K-5 setup for shoots for clients? Hell no. But then again, that's not why I'm getting the X-Pro1.