Both compact mirrorless cameras can shoot high-quality 4K video and feature microphone jacks and flip screens.
Sony Alpha 6100 - APS-C Interchangeable Lens Camera 24.2MP, 11FPS, 4K/30p
Sony Announcements (Page 4)
Goondu review: Sony Alpha 6600 - Techgoondu
Sony Unveils Alpha 6600, Alpha 6100 - The American Society of Cinematographers (en-US)
Sony Unveils Alpha 6600, Alpha 6100 - The American Society of Cinematographers (en-US)
Sony Unveils Alpha 6600, Alpha 6100 - The American Society of Cinematographers (en-US)
Sony Alpha A6100 Mirrorless Camera with 16-50mm Zoom Lens, Black (ILCE6100L/B) : Electronics
Sony Debuts Alpha 6600 & Alpha 6100 APS-C-Format ILCs - Digital Imaging Reporter
Sony Expands APS-C Mirrorless Line-up With Launch Of Two New Cameras, Sony