hey, we’re both trying to improve! 
Here’s a try to blend some grains into nind-denoise output for a more natural look. I see you like vivid colorful colors, so I slapped a Fuji Velvia LUT on it…
2506_Altstadt_Ebeltoft_0040.ORF.xmp (10.1 KB)
(not much editing in darktable, all the denoise happens in the dt_nind_denoise script, alpha=0.174)