I happen to like ON1 for some things so nothing against them. BUT their NR is without a doubt NOT the best in particular above ISO6400 to be sure. DXO runs all over them as far as detail retention and banishing noise altogether even at ISO52000. I've run too many tests above ISO6400 to not be saying this. Topaz Photo AI is also remarkable at banishing grain as well and tends to do a rather good job at keeping detail as long as you manipulate their sliders. As for over sharpening in DXO that comes ONLY when you don't bother to work with the adjustments. Sorry but there's NO way ON1 noise reduction is all that competent above ISO6400 if one goes there. So many other good things about ON1 however. I actually work with it as a preference when doing my portrait work. For landscapes and items of high detail DXO is THE go to. With Topaz a reasonably close 2nd