Here are some examples of the 2.78 splash screen by Juri Unt (www.cgstrive.com)
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at 16spp
the original noisy image:
the master denoiser version:
and the new denoiser version:
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at 64spp
the original noisy image:
the master denoiser version:
and the new denoiser version:
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at 256spp
the original noisy image:
the master denoiser version:
and the new denoiser version:
If you want a version for CUDA, which is also 2x faster to render than official version, you can get it here for 2.8 https://gumroad.com/l/tsTuV or here for 2.7 https://gumroad.com/l/SeYhy
You can also see a video of classroom made at 36spp here E-Cycles - The fastest render engine for Blender. 3.2 release available now! - #499 by bliblubli
If you want to learn how to add such functionnality, make rendering faster, add new modifiers and create your own Blender, you are welcome to take part to this course: https://gumroad.com/l/ecycle/kn67150