Both cameras are extraordinary. That's the honest starting point, and it's also what makes this comparison genuinely difficult: you're not choosing between good and bad, you're choosing between two different philosophies of what a camera should prioritize. After shooting over 30 weddings across both bodies, here's what we've actually learned.
The Sony A7R V and A7 IV exist at different ends of the same spectrum. The R V is built around resolution, 61 megapixels, extraordinary detail, files that hold up at billboard sizes. The A7 IV is built around versatility: 33 megapixels, faster burst, slightly better high-ISO performance per pixel. On paper, the choice seems obvious depending on your use case. In practice, it's considerably more nuanced.
The Specs That Actually Matter for Weddings
Here are the numbers that move the needle in a real wedding environment:
| Spec | Sony A7R V | Sony A7 IV |
|---|---|---|
| Resolution | 61 MP | 33 MP |
| Base ISO | 100–32,000 | 100–51,200 |
| Burst Rate (mechanical) | 10 fps | 10 fps (similar, but faster buffer) |
| Buffer (RAW) | ~68 frames | ~828 frames |
| Eye AF (human) | Excellent (AI-based) | Excellent |
| IBIS | 8-stop claimed | 5.5-stop claimed |
| Video (max) | 8K / 4K 60p | 4K 60p (more practical) |
| Battery life (CIPA) | 550 shots | 610 shots |
| Body weight | 723g | 659g |
| Street price (approx.) | $3,500 | $2,500 |
That buffer discrepancy is the headline number. 68 frames vs 828 frames is not a minor difference. It's the difference between confidently holding the shutter through a first dance and having to consciously ration your bursts to avoid locking up the camera at the worst possible moment.
Low Light: The Deciding Factor at Most Weddings
Venue lighting is almost always bad. Not "challenging" bad. Genuinely bad. Mixed tungsten and LED, candles combined with uplighting, outdoor receptions as the sun drops and the venue switches to Edison bulbs. This is the environment both cameras have to survive in, and it's where they diverge most clearly.
The A7 IV edges the A7R V at equivalent high ISOs because fewer pixels on the same sensor size means each individual pixel is capturing more light. At ISO 6400, our baseline for dark reception rooms, the A7 IV's files are marginally cleaner. By ISO 12800, the gap is more visible. The A7R V recovers beautifully in post given its resolution, but the A7 IV gives you a better starting point.
"The buffer discrepancy is the headline number: 68 frames vs 828 frames. That's the difference between confidently shooting a first dance and rationing your bursts to avoid locking up."
That said, the A7R V's high-resolution files do something remarkable in post: they allow aggressive crops that are simply not available with the A7 IV. In a dark reception room where you can't physically get close to the couple during their first dance, shooting on the A7R V and cropping 40% still leaves you with a 22MP file. That flexibility has saved shots that would have been unusable on the A7 IV.
Autofocus in Motion
Both cameras use Sony's excellent real-time eye AF, and both are exceptional by any objective measure. The A7R V's AI-based subject recognition system is genuinely a step forward: it handles partially obscured faces, backlighting, and fast lateral movement better than the A7 IV's generation of AF. But the A7 IV is no slouch. In standard wedding conditions, bright reception with subjects moving at moderate speed, you would be hard-pressed to tell the systems apart.
Where the A7R V's AF starts to pull ahead: shooting through veils, photographing subjects in front of backlit windows, and tracking across large groups where the subject moves between people. If you shoot a lot of ceremony coverage with challenging depth or backlighting, the A7R V's AF is meaningfully better.
Both bodies on a full wedding day rig: a 70-200 GM on the A7R V, 35mm on the A7 IV.
Which One Should You Shoot Weddings With?
Our actual answer: shoot with both. We run a two-body system on every wedding, and the best pairing in the Sony ecosystem is an A7R V on a longer lens (70-200 or 85mm) for portraits and ceremony, and an A7 IV on a wide prime (35mm or 50mm) for reception coverage and candids.
The A7R V's resolution rewards portrait-first shooting where buffer isn't a concern. The A7 IV's superior buffer rewards the spray-and-pray approach that reception coverage sometimes demands. Together, they're an almost perfect combination.
If You Can Only Have One
If the budget only extends to one body and you're primarily a wedding photographer: buy the A7 IV. The buffer difference alone justifies it. You will hit the A7R V's buffer ceiling at some point during a wedding and it will cost you a frame you can't get back. The A7 IV's 33MP files are more than sufficient for every standard wedding deliverable including large prints.
If you shoot primarily portraits, editorial, or travel: the A7R V's resolution advantage earns its premium. But for the multi-discipline chaos of a real wedding day, the A7 IV is the more practical tool.