Very interested in your CUDASynth.
I made a zoomed in crop of CUDA Synth Denoise and Sharpen vs my encoder favorite SMDegrain and LimitedSharpenFasterMod.
DGDenoise vs SMDegrain(tr = 2, thSAD = 500)
DGDenoise- much more smoothing, like it's a stronger setting than my SMDegrain Medium preset.
SMDegrain- does a good job on the grain and keeps and enhances details.
DGSharpen vs LSFmod(strength = 400)
DGSharpen- The grain pops and the image looks a bit more in focus.
LSFmod- My LSF pic looks like I didn't apply the filter. I really might of made the mistake.
DGDenoise + DGSharpen vs SMDegrain and LimitedSharpenFasterMod.
DGDenoise + DGSharpen- Well cleaned of grain, and picture has some sharpening but lost of hair and textile textures.
SMDegrain + LSFmod- Well cleaned of grain without loss of textiles and hair, picture looks clearly sharper as if in better focus.
Very good work here by Mr. DG!
I would rate these better than KNLMeansCL and WarpSharp. That being said, SMDegrain and LSF remain the tools to beat from what I can see.