I just tried DXO4 pure raw for the first time and it has improved on speed and detail with high iso images again.
With the competition of Adobe NR and Topaz denoise they had to make it faster and indeed it is now as 'fast' as Adobe NR ( about 20 sec 46mp on my computer)
The difference between adobe and DXO is there but small. DXO seems to have better detail and adobe better colour in the very high iso's - that is all i can say for now.
-anyway it amazing to see that both can turn a impossible grainy 102400 asa images into a decent A4 print and retain even colour.
It gives new life to the small sensor camera's like the Nikon 1 camera i have. 1600 asa looks still great.