Sensor:
Sony FX9 has 6k sensor outputs 4k, 10bit 4:2:2, 240-600 Mbps and Anamorphic option
Sony FX6 has 4.2k Full Frame outputs 4k, 10bit 4:2:2, 240-600 Mbps. No anamorphic option
Recording :
Sony FX9 records Full Frame & Super 35 (in 4k & HD)
Sony Fx6 records full frame (in 4k & HD) and Super 35 in HD only
Camera Mount :
Sony FX9 has a Sturdy Locking E mount (useful for heavier lenses)
Sony Fx6 has the regular E mount
Weight :
Sony FX9 is 2 kgs
Sony Fx6 is 890 gms
ISO
Sony FX9 has Dual base ISO 800 and 4000 in S-Log3. up to 102700. Better Autofocus at low light
Sony FX6 has Low / high base ISO. 800 & 12800. up to 409600
FPS
Sony FX9 has 60 fps : 4k (and 5k) and 180 fps: 2k
Sony FX6 has 120 fps at 4k and 240 fps at 2k
Extension unit for Raw output
Sony FX9 : required
Sony Fx6 : Not required
Genlock :
Sony FX9 : Yes
Sony Fx6 : No
Media :
Sony FX9 : Dual slot – XQD + SD card
Sony FX6 : Dual slot -CFexpress TypeA + SD card
Audio
Sony FX9 : 4 track with 4 audio dials
Sony Fx6 : 4 track with 2 audio dials
In the Nutshell :
Sony FX9 : Ideal for narrative film making, multicam shoots, reframing in post, broadcast work
Sony FX6 : Ideal for handheld work, gimbal shoots, events
Both the cameras available on rent at Accord Equips
Sony FX9 camera and Sony FX6 camera compared