Bob Martin is well known for testing new Sony gear ahead of their announcement. Two years ago he was spotted testing the 400mm GM lens. Today he posted this IG image claiming it was shot with the A7mk4.
Many readers asked me about this so I thought it might better to address this in a public way so that I don’t have to answer all mails. UPDATE: Bob Martin now corrected his post and indeed he meant the A7rIV and not the A7IV :)