Canon
EOS R1
Flagship 24.2MP full-frame BSI stacked RF body with 40fps burst, Dual Pixel Intelligent AF, 6K RAW, and 9.44M-dot EVF.
$6,299
Released Jul 2024
Ricoh
GR IIIx
GR III with a tighter 40mm equivalent GR lens for a natural street, travel, and documentary perspective.
$999
Released Sep 2021
EOS R1 is 2.8 years newer.
Wins
EOS R1
Wins
GR IIIx
2 categories tied
TL;DR — Key differences
- AEOS R1 has higher AF points / zones (1053 vs 49)
- AEOS R1 has higher Burst (electronic) (40 fps vs 4 fps)
- BGR IIIx has lower Weight (262 g vs 1115 g)
- AEOS R1 has higher Burst (mechanical) (12 fps vs 4 fps)
- AEOS R1 has higher 4K max frame rate (120 fps vs 60 fps)
Key specs at a glance
Size and weight, to scale
EOS R1
158 × 150 × 87 mm
1115 g (2.46 lb / 39.33 oz)
GR IIIx
109 × 62 × 35 mm
262 g (0.58 lb / 9.24 oz)
EOS R1 is 48mm wider, 88mm taller, and 52mm thicker than GR IIIx.
EOS R1 is 853 g heavier than GR IIIx.
Depth (front-to-back): 87mm EOS R1 · 35mm GR IIIx
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS R1
158 × 150 mm
GR IIIx
109 × 62 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
EOS R1
158 × 87 mm
GR IIIx
109 × 35 mm
Sensor size, to scale
EOS R1
36 × 24 mm · Full Frame
864 mm² area
GR IIIx
23.5 × 15.6 mm · APS-C
367 mm² area
2.4× larger sensor area = shallower depth of field and better low-light performance.
Lens ecosystem
Native lens selection
EOS R1
✓ more lensesCanon RF
105+
native lenses available
GR IIIx: 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
EOS R1
Subject recognition
Adds People, Dogs, Cats…
Codecs
Adds RAW, XF-HEVC S, XF-AVC S…
Dimensions (W×H×D mm)
Adds 157.6, 149.5, 87.3
Card types
Adds CFexpress Type B, CFexpress Type B
AF points / zones
1053 vs 49 — higher is better
Burst (electronic)
40 fps vs 4 fps — higher is better
Burst (mechanical)
12 fps vs 4 fps — higher is better
AA filter
Only EOS R1 supports it
Reasons to choose
GR IIIx
Subject recognition
Adds Face, Eye
Codecs
Adds MPEG-4 AVC/H.264, MOV
Dimensions (W×H×D mm)
Adds 109.4, 61.9, 35.2
Card types
Adds SD, SDHC, SDXC UHS-I
Weight
262 g vs 1115 g — lower is better
Resolution
24.24 MP vs 24.2 MP — higher is better
Both cameras share
- ✓ISO min (native) — Both 100
- ✓ISO max (native) — Both 102,400
- ✓Eye AF — Both support eye af
- ✓In-body stabilization — Both support in-body stabilization
- ✓Touchscreen — Both support touchscreen
- ✓Wi-Fi — Both support wi-fi
Pros & cons at a glance
Editorially curated highlights and trade-offs.
EOS R1
Pros
- ✓40fps electronic burst
- ✓24.2MP BSI stacked full-frame sensor
- ✓Dual Pixel Intelligent AF
- ✓6K RAW and 4K 120p video
- ✓Dual CFexpress Type B slots
Cons
- –24MP resolution
- –Very expensive
- –Large integrated-grip body
GR IIIx
Pros
- ✓40mm equivalent GR lens
- ✓Pocketable APS-C
- ✓3-axis SR
- ✓Snap focus street shooting
Cons
- –Fixed lens
- –No built-in EVF
- –Full HD video only
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for sports, EOS R1 or GR IIIx?
EOS R1 scores 8.5/10 versus 0.5/10 for GR IIIx — 40fps burst — pro-level action capture.
What's the resolution difference between the EOS R1 and GR IIIx?
EOS R1 is 24.2 MP and GR IIIx is 24.24 MP, so the GR IIIx captures more detail for cropping and large prints.
Do the EOS R1 and GR IIIx have in-body image stabilization?
EOS R1 has 8.5-stop in-body image stabilization, while gR IIIx has in-body image stabilization.
Which shoots faster bursts — the EOS R1 or the GR IIIx?
EOS R1 reaches 40 fps electronic. GR IIIx reaches 4 fps electronic.
What's the weight difference between the EOS R1 and GR IIIx?
EOS R1 weighs 1115 g and GR IIIx weighs 262 g, so the GR IIIx is 853 g lighter.
Do the EOS R1 and GR IIIx record 4K video?
EOS R1: 6K RAW (max), 4K up to 120p. GR IIIx: 4K up to 60p.
Are the EOS R1 and GR IIIx weather sealed?
EOS R1: Yes. GR IIIx: No.
How much does each cost?
EOS R1 launched at $6,299 and GR IIIx at $999. The GR IIIx is $5,300 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon and Ricoh press materials.