I don't think people would be enthusiastic about the larger file sizes and extra visual noise with VP8 in fast moving videos or those with a lot of contrast comaired to H264 Encode times were much longer too. My experience may not be typical but I could not get my videos to look as good even with much larger files. I could not find anyone with real world video using it. Unless they have made some big advances recently I just don't understand how they can claim parity.