SUMMARY
Choosing between the Sony a7R VI and a7 V involves evaluating distinct sensor architectures and video capabilities. The a7R VI boasts a 67MP stacked sensor with 8K/30fps and full-frame 4K/120fps, while the a7 V uses a 33MP sensor with cropped 4K/120fps. Counterintuitively, the a7 V's 4K downsampled from 7K can appear sharper than the a7R VI's 4K from 5K. The a7R VI introduces dual gain ISO for improved dynamic range and features a higher resolution EVF, dual card slots, and an Ethernet port, alongside support for a new battery system.
TAKEAWAYS
a7R VI has a 67MP sensor and 8K video; a7 V has a 33MP sensor.
a7 V's 4K downsampled from 7K may look sharper than a7R VI's 4K from 5K.
a7R VI offers dual gain ISO for better dynamic range and a higher resolution EVF.
Both cameras support 32-bit float audio recording, with the a7 V receiving it via firmware.