Skip to content
Specdex
Compare now
Pentax K-3 Mark III · with 24-70mm kit — APS-C DSLR · 2021
Pentax

Pentax K-3 Mark III · with 24-70mm kit

APS-C DSLR · 2021

80
/ 100
From $3,199
VS
Sony A7S III · Body only wins by 11
Sony A7S III · Body only — full-frame · 2020
Sony

Sony A7S III · Body only

full-frame · 2020

91
/ 100
From $3,498
Specdex verdict

Sony A7S III · Body only takes it — here’s why.

In our weighted Specdex score, Pentax K-3 Mark III · with 24-70mm kit lands at 80 and Sony A7S III · Body only at 91. That puts Sony A7S III · Body only ahead by 11 points — a decisive margin driven mostly by its strengths in the categories below.

Pick Pentax K-3 Mark III · with 24-70mm kit if…

  • ✓Mature system, great used market
  • ✓Proven lens lineup
  • ✓Often on sale

Pick Sony A7S III · Body only if…

  • ✓Current-gen AF system
  • ✓Proven lens ecosystem
  • ✓Strong video + stills balance
Share this comparison: Share to Reddit X / Twitter

Winner by scenario

Derived from the sub-score breakdown · not a separate test

Ergonomics

Tie

Compared on the ergonomics sub-score

Effectively tied — neither pulls a 2-point weighted lead.

Photo

Sony A7S III · Body only

Compared on the photo sub-score

Sony A7S III · Body only leads on photo (91 vs 80).

Autofocus

Sony A7S III · Body only

Compared on the autofocus sub-score

Sony A7S III · Body only leads on autofocus (89 vs 76).

Value for money

Tie

Specdex score per dollar at MSRP

Effectively tied — similar score-per-dollar at MSRP.

Pentax K-3 Mark III · with 24-70mm kit 80
vs
91 Sony A7S III · Body only

Score breakdown

Pentax K-3 Mark III · with 24-70mm kit
80
photo 80
video 72
autofocus 76
ergonomics 86
Sony A7S III · Body only
91
photo 91
video 87
autofocus 89
ergonomics 86

Specs side-by-side

Pentax K-3 Mark III · with 24-70mm kit versus Sony A7S III · Body only — full spec comparison
Spec Pentax K-3 Mark III · with 24-70mm kit Sony A7S III · Body only
Format
APS-C DSLR
full-frame
Release year
2021
2020

Pentax K-3 Mark III · with 24-70mm kit

Pros
  • +Mature system, great used market
  • +Proven lens lineup
  • +Often on sale
Cons
  • −Older AF system
  • −Heavier than modern mirrorless
  • −Firmware updates trailed off

Sony A7S III · Body only

Pros
  • +Current-gen AF system
  • +Proven lens ecosystem
  • +Strong video + stills balance
Cons
  • −Body price excludes lens
  • −Heavy for travel (flagship)
  • −Learning curve on menus

FAQ: Pentax K-3 Mark III · with 24-70mm kit vs Sony A7S III · Body only

Which is better, Pentax K-3 Mark III · with 24-70mm kit or Sony A7S III · Body only? +

Sony A7S III · Body only scores 91 on our weighted rubric — ahead by 11. Your best pick depends on the sub-scores above.

Is Pentax K-3 Mark III · with 24-70mm kit worth the price? +

At $3,199, Pentax K-3 Mark III · with 24-70mm kit delivers a Specdex score of 80 — strongest in ergonomics.

Is Sony A7S III · Body only worth the price? +

At $3,498, Sony A7S III · Body only delivers a Specdex score of 91 — strongest in photo.

Does Pentax K-3 Mark III · with 24-70mm kit or Sony A7S III · Body only last longer? +

Based on our long-term update and support ratings, both ship with multi-year support. Battery and reliability scores are visible in the breakdown above.

Which is better for photo, Pentax K-3 Mark III · with 24-70mm kit or Sony A7S III · Body only? +

Sony A7S III · Body only — leads on photo (91 vs 80). Compared on the photo sub-score.

Which is better for autofocus, Pentax K-3 Mark III · with 24-70mm kit or Sony A7S III · Body only? +

Sony A7S III · Body only — leads on autofocus (89 vs 76). Compared on the autofocus sub-score.