High quality x264 encoder
Why there is no high quality H.264 encoder within Premiere/MediaEncoder?
x264 provides much better quality at same or even lower bitrates.
This would make it much easier for encoding to webservices without losing so much quality and using so much bandwidth.
This is must if you are directly sharing files from ME to your website. Almost every proper videohosting site (Netflix, YouTube, Vimeo etc) encodes their H.264 complaint videos with x264
If you are going to add this encoder, please make sure it actually is to specs according to H.264 standards.
If you want easy way to see difference, just put ProRes HQ video to Handbrake and play with settings, you will notice.

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Antoine Autokroma.com (Independent Developer of AfterCodecs, BRAW Studio, PlumePack, Influx) commented
You can use AfterCodecs Exporter for Adobe CC with some fine settings of the x264 encoder https://www.autokroma.com/blog/How-to-Export-H264-8K
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Angelos commented
I've been waiting for this for years. It seems weird that it only has 5 votes.
The difference is very noticeable.
DaVinci Resolve has this by default in the paid version and it is way better than the default H.264 MainConcept encoder that Adobe is using. Everything from gradients, to dark scenes render a lot better with x264. That's why it's been used for streaming services such as netflix and youtube.
When I have some time I will post some screenshots to check for yourself.