Sony has quietly upgraded key features of both the Alpha 7R III and Alpha 7R IV in new "a" versions of the cameras.
Buy the Sony a7R IIIa RIGHT NOW ($1,998, Black Friday/Cyber Monday 2021)
A Review of the Sony a7R IVA Mirrorless Camera
Sony introduces a7R IIIa and a7R IVa cameras - Photofocus
Mirrorless Cameras
Sony Quietly Launches a7R IIIa and a7R IVa Mirrorless Cameras
Sony explains its strange new Sony A7R IV and A7R III mirrorless cameras
Sony Alpha ILCE-6700 + 16-50mm - Foto Erhardt
Sony Alpha a7 III Mirrorless Digital Camera with 28-70mm Lens
First pic of the 'new' Sony A7R IVa
Buy the Sony a7R IIIa RIGHT NOW ($1,998, Black Friday/Cyber Monday 2021)