Fujifilm
GFX100 II
102MP medium format flagship for studio, fashion, and landscape.
$7,499
Launch priceReleased Sep 2023
Pentax
645Z
51MP medium format DSLR that made digital MF accessible — still prized for landscape and studio.
$8,499
Launch priceReleased Apr 2014
GFX100 II is 9.4 years newer.
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Wins
GFX100 II
Wins
645Z
5 categories tied
Which would you choose?
TL;DR — Key differences
- AGFX100 II has higher Max video bit rate (720 Mbps vs 150 Mbps)
- AGFX100 II has higher AF points / zones (425 vs 101)
- B645Z has higher Burst (electronic) (20 fps vs 5.3 fps)
- AGFX100 II has higher RAW buffer depth (325 frames vs 120 frames)
- AGFX100 II has higher EVF resolution (9,440,000 vs 3,690,000)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to shareGFX100 II
152 × 117 × 99 mm
1030 g (2.27 lb / 36.33 oz)
Credit card
85.6 × 54 mm
for scale
645Z
156 × 117 × 123 mm
1470 g (3.24 lb / 51.85 oz)
GFX100 II is 4mm narrower and 24mm thinner than 645Z.
GFX100 II is 440 g lighter than 645Z.
Depth (front-to-back): 99mm GFX100 II · 123mm 645Z
Sensor size, to scale
GFX100 II
43.8 × 32.9 mm · Medium Format
1441 mm² area
645Z
43.8 × 32.8 mm · Medium Format
1437 mm² area
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
GFX100 II
AF low-light limit
-5.5 EV vs -3 EV — lower is better
Dimensions (W×H×D mm)
Adds 152.4, 117.4, 98.6
Max video bit rate
720 Mbps vs 150 Mbps — higher is better
AF points / zones
425 vs 101 — higher is better
Subject recognition
Adds Automobile, Motorcycle/Bike, Airplane…
Card types
Adds CFexpress Type B, SSD via USB
RAW buffer depth
325 frames vs 120 frames — higher is better
EVF resolution
9,440,000 vs 3,690,000 — higher is better
Reasons to choose
645Z
Dimensions (W×H×D mm)
Adds 156, 117, 123
Burst (electronic)
20 fps vs 5.3 fps — higher is better
AA filter
Only 645Z supports it
ISO max (native)
25,600 vs 12,800 — higher is better
Subject recognition
Adds Human, Vehicle
Pre-Capture / Pre-Release
Only 645Z supports it
ISO min (native)
64 vs 80 — lower is better
Battery life (CIPA)
640 shots vs 540 shots — higher is better
Both cameras share
- ✓AF frame coverage — Both 100 %
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓Burst (mechanical) — Both 8 fps
- ✓4K max frame rate — Both 60 fps
- ✓In-body stabilization (IBIS) — Both support in-body stabilization (ibis)
Pros & cons at a glance
Editorially curated highlights and trade-offs.
GFX100 II
Pros
- ✓102MP medium format
- ✓Stunning detail
- ✓Pro video
Cons
- –Very expensive
- –Large files
- –Slow operation feel
645Z
Pros
- ✓51MP medium format
- ✓CMOS sensor
- ✓Pentax color
- ✓Relatively affordable MF
Cons
- –Huge body
- –Slow operation
- –Limited lens line vs Hasselblad
Decided which one is right for you?
Compare live prices for the GFX100 II and 645Z at major authorized retailers.
Fujifilm GFX100 II
Pentax 645Z
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for wildlife, GFX100 II or 645Z?
645Z scores 9.0/10 versus 5.0/10 for GFX100 II — 20fps burst captures fleeting moments.
What's the resolution difference between the GFX100 II and 645Z?
GFX100 II is 102 MP and 645Z is 51.4 MP, so the GFX100 II captures more detail for cropping and large prints.
Do the GFX100 II and 645Z have in-body image stabilization?
GFX100 II has 8-stop in-body image stabilization, while 645Z has 7-stop in-body image stabilization.
Which shoots faster bursts — the GFX100 II or the 645Z?
GFX100 II reaches 8 fps mechanical. 645Z reaches 20 fps electronic.
What's the weight difference between the GFX100 II and 645Z?
GFX100 II weighs 1030 g and 645Z weighs 1470 g, so the GFX100 II is 440 g lighter.
Do the GFX100 II and 645Z record 4K video?
GFX100 II: 8K (max), 4K up to 60p. 645Z: 4K up to 60p.
Are the GFX100 II and 645Z weather sealed?
GFX100 II: Yes. 645Z: Yes.
Which has better battery life?
Rated battery life is 540 shots (CIPA) for the GFX100 II and 640 shots for the 645Z, giving the 645Z the edge.
How much does each cost?
GFX100 II launched at $7,499 and 645Z at $8,499. The GFX100 II is $1,000 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way GFX100 II vs 645Z vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.