Bottom line: Which one is better?
LG C9 is slightly better in this review of Sony A9F Vs LG C9 as it is slightly brighter with slightly low input lag and supports extra bandwidth of HDMI 2.1 on all four HDMI inputs which becomes important when there are HDMI 2.1 sources on the market which will make it accept a 4k @ 120Hz signal.
Stand; both TVs have stands.
Wall mount; Sony A9F has VESA 400×200 while LG C9 has VESA 300×200
Borders; Sony A9F has 0.35” (0.9cm) whereas LG C9 has 0.37” (0.9cm)
Max thickness; Sony A9F is 3.62” (9.2cm) whereas LG C9 is 1.87” (4.8cm)
Max temperature; Sony A9F has 97oF (36oC), the same as LG C9.
Average temperature; Sony A9F has 86oF (30oC) whereas LG C9 has 88oF (31oC)
Native contrast; both TVs have Inf:1
Local dimming; both TVs don’t have.
SDR real scene peak brightness; Sony A9F has 284cd/m2 whereas LG C9 has 335cd/m2
HDR real scene peak brightness; Sony A9F has 634cd/m2 whereas LG C9 has 726cd/m2
Gray uniformity; both TVs have 8.6
50% Std. Dev; Sony A9F has 1.406% whereas LG C9 has 0.989%
50% DSE; Sony A9F has 0.125% whereas LG C9 has 0.128%
Viewing angle; Sony A9F has 8.6 whereas LG C9 has 8.8.
Native Std. Dev; Sony A9F has 0.357% while LG C9 has 0.249%
Total reflections; Sony A9F has 1.3% while LG C9 has 1.4%
Pre calibration; Sony A9F has 8.3 while LG C9 has 7.6
White balance dE; Sony A9F has 3.06 whereas LG C9 has 3.46
Color dE; Sony A9F has 1.57 whereas LG C9 has 2.11
Gamma; Sony A9F has 2.14 whereas LG C9 has 2.17.
Post calibration; both TVs have 9.6
White balance dE; Sony A9F has 0.33 whereas LG C9 has 0.44
Color dE; Sony A9F has 0.78 whereas LG C9 has 0.91
Gamma; Sony A9F has 2.19 while LG C9 has 2.18
100% response time; Sony A9F has 2.5ms while LG C9 has 2.4ms.
Flicker-free; the two TVs are not flicker-free.
Black Frame Insertion (BFI); both TVs have optional BFI.
Motion interpolation; the two TVs have motion interpolation 30fps and 60fps.
24p Judder; both TVs are judder-free.
Variable refresh rate; LG C9 has HDMII Forum VRR.
Native refresh rate; both TVs have 120Hz.
Input lag; Sony A9F has 8.6 while LG C9 has 9.7
Supported resolutions; both TVs have 9.6
Total inputs; each TV has 4 HDMI, 3 UUSB, 1 Digital optical audio out, 1 Analog audio out 3.5mm, 1 composite in, 1 Tuner (Cable/Ant) and 1 Ethernet. Sony A9F has 1 IR in.
Inputs specifications; each TV supports HDR10, Dolby Vision, HLG, HDMI 2.0 Full Bandwidth, HDCP 2.2, variable Analog Audio out and Wi-Fi. Sony A9F supports USB 3.0
Audio pass-through; each TV supports ARC, 5.1 Dolby Digital and 5.1 DTS.
Low-frequency extension; Sony A9F has 67.27Hz whereas LG C9 has 67.27Hz.
Max; Sony A9F has 91.5dB SPL whereas LG C9 has 87.8dB SPL.
Weighted THD @ Max; Sony A9F has 7.199 whereas LG C9 has 3.477
IMD @ Max; Sony A9F has 9.88% whereas LG C9 has 25.15%
Smart OS; Sony A9F operates on Android TV version 8.0 whereas LG C9 on WebOS version 4.5
Interface; Sony A9F has average ease of use and smoothness while LG C9 is easy to use with average smoothness.
Ads; the two TVs have ads.
Apps and features; both TVs have apps and features.
Remote; booth TVs have large remotes.
TV controls; the two TVs have TV controls.
LG C9 is better because it is slightly brighter with slightly low input lag and supports extra bandwidth of HDMI 2.1 on all four inputs.$ 2496.99