Compare real-world fit, not spreadsheet noise.
Pick two products and tune the verdict around travel, hybrid work, wildlife, resale safety or pure value. GearAtlas weighs carry size, ecosystem cost, market timing and ownership risk in one calm decision surface.
Visual
Estimated
Workflow
Pentax K-3 Mark III
APS-C - 620g
Fujifilm X100VI
APS-C - 521g
Workflow lens
Fujifilm X100VI is the stronger fit for travel and everyday carry.
Fujifilm X100VI leads on carry and size by 22 points.
Fujifilm X100VI leads on resale strength by 24 points.
Camera size studio
Relative body dimensions
Front, back and top views are drawn from external dimensions so the size relationship stays proportional.
View
Mode
Pentax K-3 Mark III
Front view / 132 x 92mm
132 x 92 x 72mm
Fujifilm X100VI
Front view / 128 x 75mm
128 x 75 x 55mm
Width
Height
Depth
Weight
External dimensions and carry delta
Fujifilm X100VI is 4mm narrower than Pentax K-3 Mark III, Fujifilm X100VI is 17mm shorter than Pentax K-3 Mark III, Fujifilm X100VI is 17mm thinner than Pentax K-3 Mark III, and Fujifilm X100VI is 99g lighter than Pentax K-3 Mark III.
Fujifilm X100VI includes its lens in the body envelope, while Pentax K-3 Mark III still needs a lens attached.
Pentax K-3 Mark III
Fujifilm X100VI
Class benchmarks
Sensor comparison
Sensor size to scale
×1.53 crop
×1.53 crop
Both use APS-C sensors — sensor size is a wash here.
Decision matrix
Scores tuned for travel
Highlighted specs
Only specs that change the decision
Sensor
25.7MP APS-C
Sensor
40.2MP APS-C X-Trans 5 HR
Viewfinder
Optical pentaprism
Stabilisation
5-axis, up to 6 stops
Viewfinder
Hybrid OVF/EVF
Community comparison
Owner consensus · not specsCommunity comparison appears once owners vote on these products — 6 more votes across the pair will unlock it.