Tamron announced the 50-400mm F4.5-6.3 Di III VC VXD Lens today, the lens features 8X optical zoom and is made for E and Z Mount cameras, after closely examining its samples available to us the lens looks sharp and centered at almost all focal lengths
Tamron 50-400mm f/4.5-6.3 Di III VC VXD Lens (Nikon Z) and (Sony E) available at B&H store https://bhpho.to/3AHykex
Sony A7R III @ 400mm focal length ISO 800
Captured with Sony A7 IV – Focal length 400mm ISO 160
although full-size samples not available at the time of writing this post, these images do look impressive
