If you know anyone local with a d300 perhaps you can meet up with them and try their camera, see if the results are the same as yours (using the same lens and your memory card).
Hi thanks for the suggestions, I have tried virtually everything I can. I did try to lower the contrast as the D70s soft rich tones seem to start off less contrasty however, I don't get rich tones with the d300 although lowering the contrast gives a bit more latitude.
I do find it difficult to describe what I am having trouble with. If you feel inclined have a look at this NEF file. This is again not a good photo but I do want to keep away from anything arty or well lit so as to not distract from the image quality.
This is slightly under exposed but well within limits. Play with the levels and watch the area on the bridge of the babies nose and also her top left forhead.
When adjusting levels these patches seem not change much (as though they were blown) yet no channel is clipped. It looks awful and illustrates the kind of problem I find in so many photos. If I'd done this photo with the D70 a couple of tweaks would give me a pleasing image. But I just can't seem to do anything with this, it's harsh and because of those areas that don't adjust linearly with the rest of the tones it's hard to get any kind of smooth tones.
I'm sure many are going to tell me it's lighting or the way the photo was taken, but I have 1000 examples of images that were done in all kinds of conditions with the d70 that wouldn't give me any problems.
Here's the NEF I'd be interested in what you make of it and if you'd identify this kind of problem with your d300. (if you open it with capture nx2 just reset my adjustments).
http://www.louiscarresi.co.uk/gallery/test/DSC_7388.NEF
I guess the best way I can describe the differences between the D70 and quite a few other cameras is that it renders soft creamy tones, usually quite low in contrast but when you tweak them they come up a treat. I've lowered the contrast to some extent which does help with red clipping which always happens on the D300 almost every time but I don't get the latitude. I have a scene from outside my window taken with both cameras which really shows this up although lighting is different the richness is just not there with the D300. I could upload those but they are big and so I won't unless you request them.
At the end of the day I may just be looking at what the D300 is and comparing to what the d70 is. However, if that really is the case I'd say the quality of the D70 is far superiour in every way to the D300 in image quality and that doesn't make any sense given the reviews and what most people say.
As for comparing shot for shot my friend says he's going to ask someone at his camera club if I can compare some shots with a d300s owner although this may be while before I can arrange it.