Nikon
Z9
Flagship stacked mirrorless with 45MP, 8K video, and no mechanical shutter.
$5,899
Released Oct 2021
Sony
Alpha 7R III
42MP workhorse for landscape and studio before the A7R IV/V era.
$3,199
Released Oct 2017
Z9 is 4 years newer.
Wins
Z9
Wins
Alpha 7R III
1 categories tied
TL;DR — Key differences
- BAlpha 7R III has higher Burst (mechanical) (10 fps vs 0 fps)
- AZ9 has higher Burst (electronic) (120 fps vs 10 fps)
- AZ9 has higher RAW buffer depth (1000 frames vs 120 frames)
- AZ9 has higher 4K max frame rate (120 fps vs 30 fps)
- BAlpha 7R III has lower Weight (657 g vs 1340 g)
Key specs at a glance
Size and weight, to scale
Z9
149 × 150 × 91 mm
1340 g (2.95 lb / 47.27 oz)
Alpha 7R III
127 × 96 × 74 mm
657 g (1.45 lb / 23.18 oz)
Z9 is 22mm wider, 54mm taller, and 17mm thicker than Alpha 7R III.
Z9 is 683 g heavier than Alpha 7R III.
Depth (front-to-back): 91mm Z9 · 74mm Alpha 7R III
Back view, to scale
Width × Height — same proportions as the front of the body.
Z9
149 × 150 mm
Alpha 7R III
127 × 96 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
Z9
149 × 91 mm
Alpha 7R III
127 × 74 mm
Sensor size, to scale
Z9
35.9 × 23.9 mm · Full Frame
858 mm² area
Alpha 7R III
35.9 × 24 mm · Full Frame
862 mm² area
Lens ecosystem
Native lens selection
Z9
Nikon Z
90+
native lenses available
Alpha 7R III
✓ more lensesSony E
350+
native lenses available
Counts include current first-party and major third-party native autofocus lenses.
Use-case scoring
Which one for what?
Algorithmic scores from verified specs · 10 = best in class
Why pick one over the other
Reasons to choose
Z9
AF low-light limit
-8.5 EV vs -3 EV — lower is better
Subject recognition
Adds People, Birds, Dogs…
Codecs
Adds N-RAW, ProRes RAW HQ, ProRes 422 HQ…
Dimensions (W×H×D mm)
Adds 149, 149.5, 90.5
Card types
Adds CFexpress Type B / XQD, CFexpress Type B / XQD
Burst (electronic)
120 fps vs 10 fps — higher is better
RAW buffer depth
1000 frames vs 120 frames — higher is better
4K max frame rate
120 fps vs 30 fps — higher is better
Reasons to choose
Alpha 7R III
Subject recognition
Adds Human, Animal
Burst (mechanical)
10 fps vs 0 fps — higher is better
Codecs
Adds XAVC S, AVCHD, H.264
Dimensions (W×H×D mm)
Adds 126.9, 95.6, 73.7
Card types
Adds SD UHS-II, SD UHS-I
Weight
657 g vs 1340 g — lower is better
AA filter
Only Alpha 7R III supports it
ISO max (native)
32,000 vs 25,600 — higher is better
Both cameras share
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓In-body stabilization — Both support in-body stabilization
- ✓Weather sealing — Both support weather sealing
- ✓Card slots — Both 2
- ✓Touchscreen — Both support touchscreen
Pros & cons at a glance
Editorially curated highlights and trade-offs.
Z9
Pros
- ✓45MP stacked
- ✓8K 60p internal
- ✓120fps stills
- ✓Pro build
Cons
- –Heavy body
- –Expensive
- –Large files
Alpha 7R III
Pros
- ✓42MP proven
- ✓10fps with AF
- ✓Dual slots
- ✓Great used value
Cons
- –Superseded
- –No 8K
- –Older AF
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for sports, Z9 or Alpha 7R III?
Z9 scores 9.0/10 versus 3.5/10 for Alpha 7R III — 120fps burst — pro-level action capture.
What's the resolution difference between the Z9 and Alpha 7R III?
Z9 is 45.7 MP and Alpha 7R III is 42.4 MP, so the Z9 captures more detail for cropping and large prints.
Do the Z9 and Alpha 7R III have in-body image stabilization?
Z9 has 6-stop in-body image stabilization, while alpha 7R III has 5.5-stop in-body image stabilization.
Which shoots faster bursts — the Z9 or the Alpha 7R III?
Z9 reaches 120 fps electronic. Alpha 7R III reaches 10 fps electronic.
What's the weight difference between the Z9 and Alpha 7R III?
Z9 weighs 1340 g and Alpha 7R III weighs 657 g, so the Alpha 7R III is 683 g lighter.
Do the Z9 and Alpha 7R III record 4K video?
Z9: 8K UHD (max), 4K up to 120p. Alpha 7R III: 4K up to 30p.
Are the Z9 and Alpha 7R III weather sealed?
Z9: Yes. Alpha 7R III: Yes.
Which has better battery life?
Rated battery life is 740 shots (CIPA) for the Z9 and 650 shots for the Alpha 7R III, giving the Z9 the edge.
How much does each cost?
Z9 launched at $5,899 and Alpha 7R III at $3,199. The Alpha 7R III is $2,700 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Nikon and Sony press materials.