SUMMARY
The Sony A6400 and Fujifilm X-T3 are presented as strong, affordable APS-C mirrorless camera options for those upgrading from smartphones. While both are older models, they remain competitive, with Fujifilm offering marginally better image quality and 4K 60p video, and Sony excelling with its advanced AI-powered autofocus system. Neither camera features in-body image stabilization. Build quality is comparable, but Sony has slightly better battery life. The A6400 is still in production and benefits from a vast E-mount lens selection, whereas the discontinued X-T3 may be found cheaper but has slower autofocus acquisition.
TAKEAWAYS
Fujifilm X-T3 offers superior image quality and 4K 60p video; Sony A6400 has faster autofocus.
Both cameras lack in-body image stabilization.
Sony A6400 is still in production with extensive lens options; Fujifilm X-T3 is discontinued.
Both feature magnesium-alloy frames and weather sealing, with comparable battery life.