It's a feature of modern codecs that they increasingly degrade into loss of detail instead of creating visible artifacts. I wouldn't expect AV1 to look as good as VP9 at double the bitrate. If you want to do a comparison, start with the same bitrate and see if AV1 has more detail. Then you can reduce the bitrate until you start getting undesired detail loss.
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Ben Waggoner
Principal Video Specialist, Amazon Prime Video
My Compression Book
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