In hindsight i probably should not have used Depth of Field in the render. Also note programs like Topaz AI Clear /AI Gigapixel work to reduce blur so negate the DOF effect as well as noise. Also AI Clear is fully adjustable.
If you see differences in color vibrance, its because of the RGB color gamut used in saving. it confuses me to no end and different websites cant handle certain wide color gamuts anyway. The duller ones got saved to regular SRGB i guess. And the more vibrant ones probably managed to get AdobeSRGB.
noisy image 128spp render time 2:26
With Blender internal denoiser default settings. Render time 2:30
Intel Open image denoise using Albedo and Normal data
AI Clear(using just the noisy image as the input)
AI Gigapixel(using the noisy image as the input)
AI Gigapixel + AI Clear
Photoshop reduce noise
Nearly Ground Truth 2000spp render time 28 mins.
2000spp + AI Clear