I've been using K-14 v1. This is because the only free meter I could get had that as the only option.
But now I have it all and I'm sickened by the depth of relevant info and discussion.
To sum up my current understanding, it's: mix to 0dBVU and master to -16dBLU - which is about 4dB higher.
I say "about" because EBU utilizes filtering whereas VU doesn't and there are different ballistics between the standards.
iTunes is calibrated for -16.7dBLU but other platforms have their own standard.
I've never actually mastered anything to these numbers. I've mixed to K-14 then mastered till it was as loud as anything without sounding squashed.
But, given that iTunes has Sound Check and it definitely evidences the "acoustic advantage", I'm wondering if it wouldn't be good to master without much limiting/pushing.
Incidentally, this is where Pink Noise Mixing comes in handy - you end up gain staging tracks to 0dBVU if you have your noise at that level - apparently the same you'd do on an analog desk - particularly if you've received hot digital tracks.
If you right-click on a video and select "Stats For Nerds" some audio information pops up.
YouTube aims for a -12dB integrated value for sound. Rumor has it they don't use the EBU R-128 standard, though. How they implement this is by applying an offset ratio to the volume slider; they don't re-encode the file or implement limiting. If you adjust the slider and watch the values you can see this happening. The third value provided is what their reading is for the uploaded material. The Louder material is scaled and the quieter material is not. In fact, the quiet material isn't even turned up.