Canon
EOS R6 Mark III
Hybrid 32.5MP full-frame RF body with 7K RAW video, 40fps electronic burst, 8.5-stop IBIS, and Dual Pixel CMOS AF II.
$2,799
Released Nov 2025
Ricoh
GR IV
Latest GR with 25.74MP APS-C sensor, 28mm equivalent lens, 5-axis SR, 53GB internal memory, and pocket street-camera handling.
$1,499
Released Jan 2026
GR IV is 2 months newer.
Wins
EOS R6 Mark III
Wins
GR IV
1 categories tied
TL;DR — Key differences
- AEOS R6 Mark III has higher AF points / zones (1053 vs 49)
- AEOS R6 Mark III has higher Burst (electronic) (40 fps vs 4 fps)
- BGR IV has higher ISO max (native) (204,800 vs 64,000)
- AEOS R6 Mark III has higher Burst (mechanical) (12 fps vs 4 fps)
- BGR IV has lower Weight (262 g vs 699 g)
Key specs at a glance
Size and weight, to scale
EOS R6 Mark III
138 × 98 × 88 mm
699 g (1.54 lb / 24.66 oz)
GR IV
109 × 61 × 33 mm
262 g (0.58 lb / 9.24 oz)
EOS R6 Mark III is 29mm wider, 37mm taller, and 56mm thicker than GR IV.
EOS R6 Mark III is 437 g heavier than GR IV.
Depth (front-to-back): 88mm EOS R6 Mark III · 33mm GR IV
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS R6 Mark III
138 × 98 mm
GR IV
109 × 61 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
EOS R6 Mark III
138 × 88 mm
GR IV
109 × 33 mm
Sensor size, to scale
EOS R6 Mark III
35.9 × 23.9 mm · Full Frame
858 mm² area
GR IV
23.3 × 15.5 mm · APS-C
361 mm² area
2.4× larger sensor area = shallower depth of field and better low-light performance.
Lens ecosystem
Native lens selection
EOS R6 Mark III
✓ more lensesCanon RF
105+
native lenses available
GR IV: 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 R6 Mark III
Subject recognition
Adds People, Dogs, Cats…
Codecs
Adds CRM, XF-HEVC S, XF-AVC S…
Dimensions (W×H×D mm)
Adds 138.4, 98.4, 88.4
Card types
Adds CFexpress Type B, SD UHS-II
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
Battery life (CIPA)
640 shots vs 250 shots — higher is better
Reasons to choose
GR IV
Subject recognition
Adds Face, Eye
Codecs
Adds MPEG-4 AVC/H.264, MOV
Dimensions (W×H×D mm)
Adds 109.4, 61.1, 32.7
Card types
Adds microSD, microSDHC, microSDXC UHS-I
ISO max (native)
204,800 vs 64,000 — higher is better
Weight
262 g vs 699 g — lower is better
Both cameras share
- ✓ISO min (native) — Both 100
- ✓Eye AF — Both support eye af
- ✓In-body stabilization — Both support in-body stabilization
- ✓Touchscreen — Both support touchscreen
- ✓Wi-Fi — Both support wi-fi
- ✓Bluetooth — Both support bluetooth
Pros & cons at a glance
Editorially curated highlights and trade-offs.
EOS R6 Mark III
Pros
- ✓32.5MP full-frame sensor
- ✓7K RAW video & 4K 120p
- ✓40fps electronic burst with Pre-Continuous
- ✓8.5-stop IBIS
Cons
- –Single CFexpress Type B + SD slot
- –Smaller LCD than R5 II
- –LP-E6P required for full features
GR IV
Pros
- ✓25.74MP APS-C sensor
- ✓5-axis sensor-shift SR
- ✓53GB internal memory
- ✓Pocketable 28mm GR lens
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 R6 Mark III or GR IV?
EOS R6 Mark III scores 8.5/10 versus 0.5/10 for GR IV — 40fps burst — pro-level action capture.
What's the resolution difference between the EOS R6 Mark III and GR IV?
EOS R6 Mark III is 32.5 MP and GR IV is 25.74 MP, so the EOS R6 Mark III captures more detail for cropping and large prints.
Do the EOS R6 Mark III and GR IV have in-body image stabilization?
EOS R6 Mark III has 8.5-stop in-body image stabilization, while gR IV has in-body image stabilization.
Which shoots faster bursts — the EOS R6 Mark III or the GR IV?
EOS R6 Mark III reaches 40 fps electronic. GR IV reaches 4 fps electronic.
What's the weight difference between the EOS R6 Mark III and GR IV?
EOS R6 Mark III weighs 699 g and GR IV weighs 262 g, so the GR IV is 437 g lighter.
Do the EOS R6 Mark III and GR IV record 4K video?
EOS R6 Mark III: 4K up to 120p. GR IV: 4K up to 60p.
Are the EOS R6 Mark III and GR IV weather sealed?
EOS R6 Mark III: Yes. GR IV: No.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the EOS R6 Mark III and 250 shots for the GR IV, giving the EOS R6 Mark III the edge.
How much does each cost?
EOS R6 Mark III launched at $2,799 and GR IV at $1,499. The GR IV is $1,300 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon and Ricoh press materials.