Nikon
Z9
Flagship stacked mirrorless with 45MP, 8K video, and no mechanical shutter.
$5,899
Released Oct 2021
Sony
Alpha 7 III
Classic 24MP hybrid that defined the modern full-frame value proposition.
$1,999
Released Feb 2018
Z9 is 3.7 years newer.
Wins
Z9
Wins
Alpha 7 III
1 categories tied
TL;DR — Key differences
- BAlpha 7 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 89 frames)
- AZ9 has higher 4K max frame rate (120 fps vs 30 fps)
- BAlpha 7 III has lower Weight (650 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 7 III
127 × 96 × 74 mm
650 g (1.43 lb / 22.93 oz)
Z9 is 22mm wider, 54mm taller, and 17mm thicker than Alpha 7 III.
Z9 is 690 g heavier than Alpha 7 III.
Depth (front-to-back): 91mm Z9 · 74mm Alpha 7 III
Back view, to scale
Width × Height — same proportions as the front of the body.
Z9
149 × 150 mm
Alpha 7 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 7 III
127 × 74 mm
Sensor size, to scale
Z9
35.9 × 23.9 mm · Full Frame
858 mm² area
Alpha 7 III
35.6 × 23.8 mm · Full Frame
847 mm² area
Lens ecosystem
Native lens selection
Z9
Nikon Z
90+
native lenses available
Alpha 7 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 89 frames — higher is better
4K max frame rate
120 fps vs 30 fps — higher is better
Reasons to choose
Alpha 7 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
650 g vs 1340 g — lower is better
AA filter
Only Alpha 7 III supports it
ISO max (native)
51,200 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 7 III
Pros
- ✓Proven reliability
- ✓Great battery life
- ✓Strong value used
- ✓Dual card slots
Cons
- –Older AF vs newer bodies
- –4K 30p only
- –No 10-bit internal
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for sports, Z9 or Alpha 7 III?
Z9 scores 9.0/10 versus 4.0/10 for Alpha 7 III — 120fps burst — pro-level action capture.
What's the resolution difference between the Z9 and Alpha 7 III?
Z9 is 45.7 MP and Alpha 7 III is 24.2 MP, so the Z9 captures more detail for cropping and large prints.
Do the Z9 and Alpha 7 III have in-body image stabilization?
Z9 has 6-stop in-body image stabilization, while alpha 7 III has 5-stop in-body image stabilization.
Which shoots faster bursts — the Z9 or the Alpha 7 III?
Z9 reaches 120 fps electronic. Alpha 7 III reaches 10 fps electronic.
What's the weight difference between the Z9 and Alpha 7 III?
Z9 weighs 1340 g and Alpha 7 III weighs 650 g, so the Alpha 7 III is 690 g lighter.
Do the Z9 and Alpha 7 III record 4K video?
Z9: 8K UHD (max), 4K up to 120p. Alpha 7 III: 4K up to 30p.
Are the Z9 and Alpha 7 III weather sealed?
Z9: Yes. Alpha 7 III: Yes.
Which has better battery life?
Rated battery life is 740 shots (CIPA) for the Z9 and 710 shots for the Alpha 7 III, giving the Z9 the edge.
How much does each cost?
Z9 launched at $5,899 and Alpha 7 III at $1,999. The Alpha 7 III is $3,900 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Nikon and Sony press materials.