I recently purchased a new D2Xs and I am very happy with it. It has many features that I really like that were not in D2X. Many people asked me if there is any improvement in the noise and I did a mini review here comparing files from both cameras.
Main Observation: I have not seen much difference in the image quality between D2X and D2Xs. I am using ADOBE CAMERA RAW (ACR) to view and convert RAW files as it is one of the fastest RAW coverters I have seen till now. However when I view or convert the images from RAW to JPEG using Nikon NX the files are much much better. There is a significant difference between the ACR and Nikon NX converted files. I cannot stress enough how beautiful the files looked when using Nikon NX. Bad thing about NX is its too slow. My plan was to buy a Canon 5D just for shooting images at higher ISOs but instead I opted to go with Nikon D2Xs and there are no regrets.
Update: I recently upgraded Nikon NX 1.0 to 1.0.1 and its much better now. I am able to convert more than 1000 raw files to JPEGs without any problems.
|Settings (85/1.4 lens)||D2X||D2XS|
|ISO 800, F5.6, 1/8second||JPG, NEF||JPG, NEF|
|ISO 1600, F5.6, 1/15second||JPG, NEF||JPG, NEF|
|ISO 3200, F5.6, 1/30second||JPG, NEF||JPG, NEF|
Currently I own D2H, D2X, D2Xs and a couple of D70 (converted to IR) cameras ( I sold my D200 ) 70-200/2.8 VR lens, 17-55/2.8, 10.5mm, 12-24mm, 85/1.4, 50/1.4 and few other not so fast lenses.