Canon 5D Mark IV vs. Fujifilm GFX 100S: A Hands-On Journey Through Two Powerful Cameras

When you’re on the hunt for your next camera, the choices can sometimes feel overwhelming - especially when two titans from very different photographic worlds come head to head. The Canon EOS 5D Mark IV, an established advanced DSLR stalwart from 2016, clashes with the relatively fresh face of the medium format mirrorless Fujifilm GFX 100S from 2021. Both promise impressive image quality, solid build, and a professional user experience - but their very different design philosophies, sensor architectures, and target audiences set the stage for a fascinating comparison.

Having spent weeks putting both through their paces across a spectrum of photography disciplines, I’m here to share my lump-in-the-throat excitement and pragmatic observations. Whether you're a seasoned pro, an enthusiastic hobbyist, or someone curious about making the jump to medium format, let's unpack these two cameras from bottom to top - literally and figuratively.

Physical Presence and Ergonomics: The Feel in Your Hands

First impressions matter - grabbing a camera for the first time tends to reveal more than a spec sheet ever can. The Canon 5D Mark IV clings to its DSLR roots with a comfortable but solid mid-size SLR body. The Fujifilm GFX 100S, meanwhile, embraces a mirrorless, SLR-style form factor that’s surprisingly compact for a medium format.

If you glance at the size-comparison image here, you’ll see the GFX 100S is roughly the same height and width as the 5D Mark IV but noticeably deeper - thanks mostly to a bigger grip and the absence of an optical mirror box. The 5D Mark IV’s heft (890g vs. 900g for the GFX) feels reassuringly balanced, with deep thumb contours and a broad grip that DSLRs typically nail. The GFX 100S’s grip errs toward a boxier feel, but its mirrorless cleanliness results in fewer protrusions and a sleek profile that I often preferred on longer shoots or when stowing gear in a compact bag.

Pick your poison: if you crave classic DSLR heft and tactile familiarity, the Canon excels. But if you lean toward compactness without sacrificing grip security, the Fuji is a winner.

Control layouts reinforce these impressions. Both cameras sport multi-functional dials and well-placed buttons, but their design philosophies diverge.

Looking at the top view, the Canon offers dedicated dials for ISO, shutter speed, and exposure compensation - a boon for tactile shooting and quick adjustments. The GFX 100S leans more into menu-driven settings with fewer dedicated external dials, but the presence of a detailed electronic viewfinder compensates by displaying rich shooting info in real time. Canon purists will find their instincts rewarded; Fuji shooters might appreciate flexibility once they acclimate.

Sensor Size and Image Quality: Full Frame vs. Medium Format

Here’s where the rubber meets the road - literally millions of pixels under the hood, ready to capture light, color, and detail in stunning resolution.

Canon’s 5D Mark IV sports a traditional 36x24mm full-frame CMOS sensor delivering 30 megapixels, while the Fujifilm GFX 100S boasts a massive 44x33mm medium format BSI-CMOS sensor at a staggering 102 megapixels. The difference in sensor area (864 mm² vs. 1452 mm²) lets the GFX soak up significantly more light and detail - a factor that becomes obvious when scrutinizing fine textures or printing large enlargements.

In practical terms, the GFX’s larger sensor translates to richer tonal gradation and superior color depth - Fuji’s color science further nudges this advantage with impressively natural skin tones and painterly bokeh rendering. The Canon, however, remains steadfastly chargeable in situations demanding versatile ISO performance and faster shooting agility.

Thanks to the 5D Mark IV’s well-understood 24.8-bit color depth, 13.6 stops of dynamic range, and respectable ISO baseline, it handles various lighting conditions without fuss. The GFX, while not officially tested on DxO, flaunts its medium format benefits in real-world shooting - shadows retain more detail, highlights roll off more smoothly, and midtones appear more nuanced.

But beware: the massive resolution of the Fuji comes at a cost - larger file sizes and more intensive post-processing demands. If you’re tethered to time or storage constraints, Canon’s leaner 30MP files have their appeal.

LCD and Viewfinder: Peeking Through the Window to Your Scenes

When framing your shots, the screen and viewfinder become your primary touchpoints - offering critical feedback and immersion.

Both cameras sport a 3.2-inch rear display with touch input, but the Fuji’s 2360k-dot tilting monitor outshines the Canon’s fixed 1620k-dot panel in resolution and flexibility. I found myself tilting the GFX screen in tricky angles - over crowds, low to the ground - without losing clarity or responsiveness.

The Canon compensates with an optical pentaprism viewfinder that many shooters still prefer for its natural eye comfort and zero lag. Its 0.71x magnification delivers a bright, life-like view with 100% coverage, though it lacks any overlay information like histograms or focus peaking.

The GFX 100S embraces a modern electronic viewfinder (EVF) with an impressive 3.69-million-dot OLED display covering 100% of the frame and a slight edge in magnification (0.77x). Highlighting focus peaking, histogram overlays, and live exposure feedback, the EVF became my favorite tool for precise manual focusing and composition control in this shootout.

Autofocus and Burst Shooting: Speed vs. Precision

For dynamic photography - think wildlife, sports, or street snaps - autofocus proficiency and frames per second count more than just pixel density.

Canon’s 61-point autofocus system with 41 cross-type points delivers reliable and fast phase-detection AF, including face detection. However, the system, designed for DSLRs, sometimes feels a bit conservative compared to more modern mirrorless rivals.

The Fuji’s hybrid autofocus system, utilizing 425 focus points with phase and contrast detection, surprised me with its precision - locking onto subjects swiftly, even in tricky lighting. Surprisingly, it doesn’t have specialized animal eye autofocus, which some competitors now offer, but its face detect is rock solid.

Burst rates favor the 5D Mark IV’s 7 frames per second, allowing extended sequences - crucial for catching critical moments in sports or fluttering wildlife. The GFX 100S clocks in at a respectable 5 fps, which is promising given the heavyweight sensor, but not quite in the realm of action cameras.

If wildlife or fast-paced sports is your photographic playground, Canon’s autofocus system and shooting speed offer a clear benefit. For studio or landscape photographers valuing focus accuracy over speed, Fuji’s AF shines brighter.

Weather Sealing and Durability: Ready for Adventure?

Anyone shooting outside appreciates rugged construction and environmental sealing to keep their gear humming through rain, dust, and rough terrain.

Both cameras feature weather-sealed designs capable of withstanding moderate moisture and dust, though neither is fully "waterproof" or shockproof. That said, Canon’s track record with durable DSLRs means the 5D Mark IV has proven reliability under tough conditions for years.

Fujifilm's GFX 100S introduces a modern sealed body with magnesium alloy construction, and its mirrorless architecture reduces mechanical wear points. While slightly less proven in field abuse scenarios due to its newer status, initial reports have been positive.

If you plan intensive outdoor shooting - storms, deserts, or the muddy sidelines - either camera’s sealing will suffice with a little care. But for rugged reliability, the Canon’s legacy offers peace of mind.

Lens Ecosystem: Quantity vs. Specialist Quality

Lens choices build or break your camera experience.

Canon’s EF mount serves up over 250 lenses - an enthusiast’s dream buffet spanning affordable primes, professional zooms, specialty lenses, and third-party offerings. Whether you want a dreamy 85mm f/1.2, an ultra-wide 16-35mm, or fast super-zoom telephotos for wildlife, Canon’s options are vast and battle-tested.

Fujifilm’s G mount, tailored for the GFX system’s medium format sensibilities, currently lists 13 native lenses. These are meticulously crafted, albeit pricier, with optical designs optimized for the sensor size. Though more limited in number, Fuji’s lenses impress with razor-sharp quality and excellent rendering.

If versatility and budget flexibility matter, Canon’s sprawling EF mount lenses dominate. But for collectors who value medium format premium glass and outstanding sharpness, Fuji’s offerings are tempting - and still growing.

Battery Life and Storage: How Long Can They Roar?

Shooting day-long events or travel requires dependable stamina.

The Canon 5D Mark IV’s LP-E6 battery delivers an impressive approximate 900 shots per charge according to CIPA standards. It easily powers a full wedding or outdoor session with room to spare. Dual card slots (CompactFlash + SD) provide redundancy - a vital professional feature.

The Fujifilm GFX 100S, with its newer NP-W235 battery, manages about 460 shots on a charge, roughly half Canon’s endurance. However, fast charging, mirrorless power efficiency improvements, and dual SD card slots (UHS-II) mitigate this somewhat.

If battery longevity is a priority for you, especially when access to power is limited, Canon’s longevity is more dependable. The Fuji requires more battery discipline or spares.

Connectivity and Extras: The Digital Toolbox

Both cameras arrive with built-in Wi-Fi for remote control and image transfer. The Canon adds NFC and GPS - enabling handy geo-tagging and quick pairing. The Fujifilm includes Bluetooth, enhancing smartwatch or mobile tethering.

Video enthusiasts will appreciate that both can shoot 4K UHD. The Canon 5D Mark IV features 4K DCI (4096 x 2160) at up to 30fps with decent codecs (MPEG-4, Motion JPEG), while the Fuji offers higher bitrate 4K 60fps with more advanced H.265 codec support - great for high-quality filmmaking workflows.

Real-World Test Shots: Judging the Output

No spec sheet or marketing brochure replaces actual images. I shot a diverse gallery across multiple disciplines - portraits, landscapes, wildlife, macro, and night scenes.

Canon 5D MIV front Canon 5D MIV screen back Fujifilm GFX 100S front Fujifilm GFX 100S screen back

Here’s what I found:

• Portraits: Fuijfilm’s medium format sensor and exquisite color science render skin with velvety smoothness and beautiful bokeh transitions. The Canon produces clean, natural tones but with slightly less tonal nuance.

• Landscapes: The GFX’s higher resolution and dynamic range truly shine, capturing extraordinary detail and subtle shadow gradations. The 5D Mark IV handles this well but with less depth for large prints.

• Wildlife and Sports: Canon’s autofocus speed and burst capabilities deliver more keepers in action sequences. The Fuji can keep up but requires more patient shooting.

• Macro: Both cameras rely on lenses here; Canon’s extensive lens options shine, but the Fuji’s stabilization and sensor advantage aid macro detail capture.

• Astro/Night: Fuji’s sensor cleans up noise wonderfully at high ISO, though slower frame rates mean longer exposures; Canon performs competently with faster ISO roll-offs.

• Video: Fuji’s superior codec, higher frame rate options, and 5-axis IBIS give it the edge for video shooters.

Overall Performance Ratings and Genre-Specific Scores

Inspecting a distilled performance dashboard helps visualize strengths.

The Canon 5D Mark IV scores strongly in autofocus speed, battery life, and lens availability. The Fujifilm GFX 100S dominates in resolution, color depth, and sensor-driven image quality metrics.

Breaking it down by genre, this chart gives more nuance:

• Sports & Wildlife: Canon leads due to superior AF and FPS.
• Portrait & Landscape: Fuji wins on resolution, tonal quality, and dynamic range.
• Street & Travel: Canon’s size, battery, and AF responsiveness make it more versatile.
• Macro & Night: Slight edge to Fuji’s sensor tech and stabilization.
• Video: Fuji takes the crown for modern codecs and stabilization.
• Pro Studio Work: Fuji impresses for detail and quality, Canon for workflow integration and dependability.

Who Should Buy the Canon EOS 5D Mark IV?

If you’re a seasoned photographer or professional who values a reliable, mature system with robust autofocus, extensive lens choices, and excellent battery life - the 5D Mark IV remains a stalwart partner. Particularly for wedding, event, sports, and run-and-gun street photography where speed and flexibility matter, this camera reliably gets the job done. Its ergonomics and interface cater to photographers ingrained in DSLR traditions or switching from earlier Canon bodies.

Priced much lower (around $3299 at launch), it holds impressive value, especially for those who already invest in Canon EF glass. It’s a cost-effective way to get solid full-frame performance and proven durability.

Who Should Consider the Fujifilm GFX 100S?

For photographers who crave absolute image quality - whether it’s landscape fine art, high-end portraits, or commercial advertising work - the GFX 100S’s 102MP medium format sensor redefines what detail and tonality can achieve. Those willing to invest in a more specialized system, trade some shooting speed for image fidelity, and learn mirrorless ergonomics will be rewarded richly.

Its 5-axis IBIS, vibrant EVF, and impressive video credentials also make it an attractive hybrid option for creatives straddling stills and film. Yes, it’s pricier (around $5999), but for those who wield it purposefully, it’s an investment in visual excellence.

Testing Methodology Disclosure

Throughout my testing, I attached each camera to my usual trusted tripod, used standardized prime lenses where possible (Canon 85mm f/1.4 and Fuji GF 110mm f/2), and employed consistent RAW workflow using Lightroom Classic, focusing on uncompressed file quality assessment. Autofocus testing took place in varied lighting, indoors and outdoors, tracking moving subjects to replicate real-world demands. Video tests utilized external monitors and headphones for precise evaluation.

Such hands-on, repeatable methods ensure observations reflect everyday shooting conditions faithfully - not glossy marketing hyperbole.

The Final Verdict: Different Cameras for Different Dreams

Choosing between the Canon 5D Mark IV and Fujifilm GFX 100S isn’t about picking a “better” camera - it’s about identifying what fits your photographic ambitions, workflow, and budget.

The Canon 5D Mark IV is the versatile workhorse that will never let you down, with tried-and-true craftsmanship, fast autofocus, and an already massive lens arsenal. It represents a pinnacle of DSLR evolution perfectly suited for demanding, fast-paced photography.

On the flip side, the Fujifilm GFX 100S unlocks a rarified realm of visual fidelity and color purity, pushing boundaries in medium format photography without enormous bulk. For landscape artists, studio photographers, and image quality obsessives aiming for the ultimate in detail and tonal nuance, this camera is a revelation.

In the end, both cameras exemplify excellence - you just need to pick your flavor of photographic magic.

Happy shooting!

Disclosure: Both cameras were loaned to me for hands-on testing by authorized dealers. No financial incentive or influence affected this comparative review.