Hey Jan,
the HDR is attached here.
Regarding the COR HI-q denoiser: I am of course aware, that it's not a surrogate for enough passes. :)
BUT: with the same amount of passes, the AI denoiser has not the same issue - at all.
Pics might still be a bit grainy - but equally grainy, everywhere... and not 3X more on round edges & other bump areas.
In many test I had already done one year ago, the Hi-q denoiser showed jaggy edges, even after very, very many passes.... like hundreds of passes.
And generally, who wants to render every time until 1 % noise? That's not the sense of having a denoiser function. :)
Fact is: the hi-q denoiser does not work properly... to say the least & with all due respect to the complicated work of programming such stuff.
Downloading V7 right now and going to give it a go.
Greetings!