Sony FX3 vs FX6 vs A7S III – The 2025 Comprehensive Comparison
The Sony A7S III, FX3, and FX6 all use a 12 MP-class full-frame sensor family; the A7S III and FX3 use a 12.1 MP Exmor R sensor, while the FX6’s spec is listed as 10.2 MP effective for 4K video. They all employ dual-base ISO: the A7S III and FX3 offer 640 (low) and 12,800 (high) in S-Log3, while the FX6 in Cine EI mode uses 800 and 12,800. Low-light performance is highlighted by 8.4 µm pixels and low read noise, with ISO ranges claimed up to 409,600 and realistically usable up to 51,200–102,400. All three support S-Cinetone and, by