Sony
Alpha 7S III
12MP low-light video specialist with 4K 120p, 16-bit RAW HDMI, and excellent autofocus.
$3,499
Launch priceReleased Sep 2020
Sony
RX1R II
Full-frame 42MP compact with fixed 35mm f/2 Zeiss lens — still unmatched for discreet high-res street work.
$3,299
Launch priceReleased Oct 2015
Alpha 7S III is 4.9 years newer.
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Wins
Alpha 7S III
Wins
RX1R II
4 categories tied
Which would you choose?
TL;DR — Key differences
- AAlpha 7S III has higher ISO max (native) (102,400 vs 25,600)
- AAlpha 7S III has higher Max video bit rate (600 Mbps vs 150 Mbps)
- BRX1R II has higher Resolution (42.4 MP vs 12.1 MP)
- BRX1R II has higher Burst (electronic) (20 fps vs 10 fps)
- AAlpha 7S III has higher 4K max frame rate (120 fps vs 60 fps)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to shareAlpha 7S III
129 × 97 × 81 mm
699 g (1.54 lb / 24.66 oz)
Credit card
85.6 × 54 mm
for scale
RX1R II
113 × 65 × 72 mm
507 g (1.12 lb / 17.88 oz)
Alpha 7S III is 16mm wider, 32mm taller, and 9mm thicker than RX1R II.
Alpha 7S III is 192 g heavier than RX1R II.
Depth (front-to-back): 81mm Alpha 7S III · 72mm RX1R II
Sensor size, to scale
Alpha 7S III
35.6 × 23.8 mm · Full Frame
847 mm² area
RX1R II
35.9 × 24 mm · Full Frame
862 mm² area
Lens ecosystem
Native lens selection
Alpha 7S III
✓ more lensesSony E
350+
native lenses available
RX1R II: mount data unavailable
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
Alpha 7S III
AF low-light limit
-6 EV vs -4 EV — lower is better
Dimensions (W×H×D mm)
Adds 128.9, 96.9, 80.8
ISO max (native)
102,400 vs 25,600 — higher is better
Max video bit rate
600 Mbps vs 150 Mbps — higher is better
Codecs
Adds XAVC HS, XAVC S, XAVC S-I
AA filter
Only Alpha 7S III supports it
4K max frame rate
120 fps vs 60 fps — higher is better
Internal RAW video
Only Alpha 7S III supports it
Reasons to choose
RX1R II
Dimensions (W×H×D mm)
Adds 113.3, 65.4, 72
Resolution
42.4 MP vs 12.1 MP — higher is better
Subject recognition
Adds Bird, Vehicle
Burst (electronic)
20 fps vs 10 fps — higher is better
Pre-Capture / Pre-Release
Only RX1R II supports it
Weight
507 g vs 699 g — lower is better
IBIS effectiveness
7 stops vs 5.5 stops — higher is better
Battery life (CIPA)
640 shots vs 600 shots — higher is better
Both cameras share
- ✓AF points / zones — Both 759
- ✓AF frame coverage — Both 94 %
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓RAW buffer depth — Both 120 frames
- ✓In-body stabilization (IBIS) — Both support in-body stabilization (ibis)
Pros & cons at a glance
Editorially curated highlights and trade-offs.
Alpha 7S III
Pros
- ✓Best-in-class low light
- ✓4K 120p
- ✓Full-size HDMI
- ✓Strong IBIS
Cons
- –12MP stills limit
- –Older generation now
- –No 8K
RX1R II
Pros
- ✓42MP full-frame in pocket class
- ✓Zeiss 35mm f/2 lens
- ✓Pop-up EVF
- ✓No AA filter
Cons
- –Fixed lens
- –Slow AF by modern standards
- –Premium price when new
Decided which one is right for you?
Compare live prices for the Alpha 7S III and RX1R II at major authorized retailers.
Sony Alpha 7S III
Sony RX1R II
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for portraits, Alpha 7S III or RX1R II?
RX1R II scores 8.5/10 versus 6.5/10 for Alpha 7S III — 42.4MP — excellent for large prints and crops.
What's the resolution difference between the Alpha 7S III and RX1R II?
Alpha 7S III is 12.1 MP and RX1R II is 42.4 MP, so the RX1R II captures more detail for cropping and large prints.
Do the Alpha 7S III and RX1R II have in-body image stabilization?
Alpha 7S III has 5.5-stop in-body image stabilization, while RX1R II has 7-stop in-body image stabilization.
Which shoots faster bursts — the Alpha 7S III or the RX1R II?
Alpha 7S III reaches 10 fps electronic. RX1R II reaches 20 fps electronic.
What's the weight difference between the Alpha 7S III and RX1R II?
Alpha 7S III weighs 699 g and RX1R II weighs 507 g, so the RX1R II is 192 g lighter.
Do the Alpha 7S III and RX1R II record 4K video?
Alpha 7S III: 4K up to 120p. RX1R II: 4K up to 60p.
Are the Alpha 7S III and RX1R II weather sealed?
Alpha 7S III: Yes. RX1R II: No.
Which has better battery life?
Rated battery life is 600 shots (CIPA) for the Alpha 7S III and 640 shots for the RX1R II, giving the RX1R II the edge.
How much does each cost?
Alpha 7S III launched at $3,499 and RX1R II at $3,299. The RX1R II is $200 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way Alpha 7S III vs RX1R II vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.