Jfreak, thanks I will try to summarise the technique, when I fully appreciate the method myself. It is best just to immerse yourself in the ACR RAW module and play around with the detail tab, and try the suggested settings. What you will find the noise reduction section has an immense effect with the raw DNG image and it seems to work very differently compared to other noise reduction packages. My understanding is that the DNG files have very little pre processing, and the ACR noise reduction algorithm just works brilliantly! To be honest, I have not used the ACR noise reduction before, as I left it to the after market packages to work on the 16 bit TIFF files in CS5.
Keeping the shots flowing, some shots this afternoon with the 75 Lux at f/2.0 and 1.4 resp. These shots were sharpened in ACR detail section with the mask on