Important New Findings
It also seems to play a big role which camera is used. Today I did tests with photos from my Ricoh GRIII and here Denoise from Lightroom failed completely! But the result of DxO DeepPrime XD came out very well... I tried with different photos of the GRIII with always the same result: DxO very good, Lightroom total failure.
After this test I revise my earlier statement: I also keep PureRaw always up to date as long as the results are like that.
GRIII, ISO 12800, LR, To say that this is very bad would be an understatement!
GRIII, ISO 12800, DxO, much better, yes I dare to say: comparably very good! It would maybe be even better by using the previous version of DeepPrime.
I have no idea why this is like that because apart from LR AI Denoise the GRIII-files work very well in Lightroom and I never had any problems at all. But this clearly shows that individual Denoise tests must be made to draw the right conclusion!
I hope this helps.
Cheers,
Reto