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Sony a7 III vs Canon R6 Mark II

The value full-frame classic against the newer video-and-autofocus champion. Save with Sony's a7 III, or pay for Canon's uncropped 4K60 and modern speed?

By Stephen V.Last updated How we pick

Both are 24-megapixel full-frame hybrids with in-body stabilization and dual card slots, and both are excellent — but they’re from different generations and different systems. The Sony a7 III is the camera that made full-frame mainstream: a superb low-light sensor at a price that keeps dropping. The Canon R6 Mark II is newer and more capable, with uncropped 4K60, class-leading autofocus and very fast burst shooting.

Choosing between them is partly value versus features, and partly which lens system you want to commit to. Here is how they compare.

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Sony a7 IIICanon EOS R6 Mark II
SensorFull-frame, 24.2 MPFull-frame, 24.2 MP
Video4K30 (full-width readout)4K60 uncropped, 6K RAW over HDMI
AutofocusEye AF (very good)Class-leading subject detection
Stabilization5-axis in-body5-axis in-body
Card slotsDual (SD)Dual (SD UHS-II)
MountSony ECanon RF
Weight650 g670 g

Both cameras in full

#1Best value full-frame

Sony a7 III

The camera that made full-frame mainstream, and still a smart buy if you find it discounted against the a7 IV. Lower resolution and an older screen, but the same excellent low-light sensor and stabilization — for a lot of shooters the savings are better spent on a lens.

Strengths

  • Superb low-light full-frame sensor
  • In-body stabilization and dual slots at a lower price
  • Battery life that still beats many newer bodies

Trade-offs

  • 24 MP and a lower-res, non-articulating screen
  • Older, single-joystick menu and a dimmer viewfinder
SensorFull-frame CMOS, 24.2 MP
MountSony E
Video4K30 (full-width readout)
Stabilization5-axis in-body (IBIS)
Weight650 g with battery

Specifications read from the manufacturer listing, on July 18, 2026.

#2Best for video and autofocus

Canon EOS R6 Mark II

Canon's do-everything full-frame hybrid and the natural rival to the Sony a7 IV. Uncropped 4K60, superb autofocus and in-body stabilization, tuned more for speed and video than for megapixels. If you are on Canon glass and want one body for paid work, this is it.

Strengths

  • Uncropped 4K60 with excellent rolling-shutter control
  • Class-leading autofocus and subject detection
  • In-body stabilization and dual card slots

Trade-offs

  • 24 MP is modest for heavy cropping or large prints
  • Can overheat in the longest 4K60 clips
SensorFull-frame CMOS, 24.2 MP
MountCanon RF
Video4K60 uncropped, 6K RAW over HDMI
Stabilization5-axis in-body (IBIS)
Weight670 g with battery

Specifications read from the manufacturer listing, on July 18, 2026.

Which should you buy?

Buy the Sony a7 III ifvalue is the priority and you shoot mostly stills or straightforward 4K30. Its full-frame low-light performance is still excellent years on, it has in-body stabilization and dual slots, and it’s often significantly cheaper than the R6 Mark II. The E-mount also has the broadest, most affordable full-frame lens selection, with huge third-party support — which can save you a lot on glass. The catches are an older menu and a lower-resolution, non-articulating screen.

Buy the Canon R6 Mark II if video and autofocus lead. Its uncropped 4K60 keeps your lenses wide where the a7 III tops out at 4K30, its subject-detection autofocus is a step ahead, and its burst shooting is much faster for action. The fully articulating screen and modern interface are far nicer to live with, too. You pay more, but you get a newer, more capable hybrid.

The deciding factors are budget, video needs and lens system. If you find the a7 III well discounted and shoot mostly stills, it’s a lot of full-frame for the money. If you want the best video and autofocus and don’t mind paying, the R6 Mark II is the stronger all-round camera. Not sure you need full-frame at all? Our full-frame vs APS-C guide is worth a read first.

Frequently asked questions

Is the Sony a7 III still worth buying?

Yes, especially when discounted. It shares the full-frame sensor size, in-body stabilization and dual card slots that make full-frame appealing, and its low-light performance remains excellent. You give up the newer body's uncropped 4K60, faster autofocus and modern screen and menu — fair trades if you shoot mostly stills and want to save money.

Which is better for video?

The Canon R6 Mark II. It shoots uncropped 4K60 (using the full sensor width) plus 6K RAW over HDMI, while the a7 III tops out at 4K30. Combined with better autofocus and a fully articulating screen, the R6 Mark II is the clearly stronger video camera; the a7 III is fine for straightforward 4K30 work.

Do they use the same lenses?

No. The a7 III uses the Sony E-mount and the R6 Mark II uses the Canon RF mount, and they aren't cross-compatible without adapters. Choosing a body is choosing a lens system. Sony's E-mount currently has the widest third-party lens support, which often means cheaper options; Canon's RF lineup is excellent but more first-party.

Which has better autofocus?

The Canon R6 Mark II has newer, class-leading subject detection that tracks people, animals and vehicles very reliably. The a7 III's Eye AF is still very good for portraits and general shooting, but the R6 Mark II is a noticeable step ahead for fast or unpredictable subjects and for video.

Sources

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