The Intel Media SDK provide sample applications that can be used for transcoding to provide real data application.
I am currently investigating if there is any Intel official benchmarking information for those specific processors that you are inquiring about.
Regarding Xeon processors you can check on the following page: https://software.intel.com/en-us/intel-media-server-studio , this image is from the mentioned page:
Sadly, I don't currently have access to any hardware with which to run benchmark tests for myself.
Thanks for pointing me at the Intel Media Studio Server page. I'd come across that chart before, but from what I could see, it's not particularly clear whether that benchmark is using Quick Sync and/or the FPGA to transcode with.
Thanks again for your quick response.