•   Overview
•   Advantage of Sony KD-55AF9
•   Advantage of Sony KD-55AF8
•   Common Strengths and Weaknesses
•   Selected Features
•   Specifications

Here we are comparing Sony KD-55AF9 to Sony KD-55AF8 to reveal their common strengths and weaknesses as well as the differences between them which will help you in making a correct decision before the purchase. Both models have the same 4K UHD (3840 x 2160) resolution and they both support HDR.

We have evaluated the TVs from available features and specifications. Sony KD-55AF9 gets higher overall score in our ranking system which is based on the display specifications, video, audio and other features, connectivity and format support.

This section shows the features and specifications which are the reason to choose Sony KD-55AF9 over Sony KD-55AF8.

	Sony KD-55AF9	vs	Sony KD-55AF8
Higher Brightness	400 nits	vs	300 nits
Lower Input Lag	20 ms	vs	21 ms
Object-based Super Resolution		vs
Pixel Contrast Booster		vs
Higher Speaker Power Rating	13 W + 13 W + 13 W + 13 W + 13 W + 13 W + 10 W + 10 W	vs	10 W + 10 W + 10 W + 10 W + 10 W
TV Center Speaker Mode		vs
Dolby AC-4		vs
Newer Bluetooth Version	4.2	vs	4.1
HDMI Audio Return Channel (ARC)	eARC	vs
More RAM	4 GB	vs	2 GB
Auto Calibration with CalMAN		vs

This section shows the features and specifications which are the reason to choose Sony KD-55AF8 over Sony KD-55AF9.

	Sony KD-55AF9	vs	Sony KD-55AF8
Higher Rec.2020 Color Space Coverage	75%	vs	76%

OLED displays

Sony KD-55AF9 and Sony KD-55AF8 have organic light-emitting diode (OLED) displays. This is a self-emissive display which can completely turn off individual pixels leading to the ideal black levels and better contrast during HDR compared to any LCD displays. This makes them to be the best choice for dark rooms. OLED enables a simpler internal structure than conventional displays. With just a few layers, OLED TVs are very lightweight and thin. OLED displays also have better viewing angles. However, they are not able to achieve such high brightness as modern LCD displays which makes them less suitable in bright rooms.

HDR10

Sony KD-55AF9 and Sony KD-55AF8 support HDR10 which was announced on August 27, 2015, by the Consumer Technology Association and uses the wide-gamut Rec. 2020 color space. It is not backward compatible with SDR. It sends static metadata via video stream to the TV which calibrates its screen brightness and color according to that. HDR10 is technically limited to a maximum of 10,000 nits of brightness and uses 10-bit color which corresponds to 1024 shades of the primary RGB colors.

Dolby Vision

Sony KD-55AF9 and Sony KD-55AF8 also support Dolby Vision which is an update to HDR10 by adding dynamic metadata that can be used to more accurately adjust brightness levels up to 10,000 nits on a scene-by-scene or frame-by-frame basis and supports up to 12-bit color depth (4096 shades of RGB) and 8K resolution.

And in the end we display all the specifications which are present for both models.

Note: The following table shows only those details which are applicable for both models and excludes the ones that are applicable for only one model. If you want to see a full list of specs for each model please visit their individual pages here - Sony KD-55AF9 and here - Sony KD-55AF8.

BASICS	Sony KD-55AF9	Sony KD-55AF8
Brand	Sony	Sony
Series	AF9	AF8
Model	KD-55AF9	KD-55AF8
Size	55"	55"
Country	UK	UK
Release Year	2018	2018
Smart TV

DISPLAY	Sony KD-55AF9	Sony KD-55AF8
Display Type	OLED	OLED
Actual Size (Diagonal)	54.6" (138.8 cm)	54.6" (138.8 cm)
Resolution	4K UHD (3840 x 2160)	4K UHD (3840 x 2160)
Refresh Rate	100 Hz/120 Hz	100 Hz/120 Hz
Screen Design	Flat	Flat
Contrast	Infinite Contrast	Infinite Contrast
Color	TRILUMINOS™ Display	TRILUMINOS™ Display
Viewing Angle	Perfect Viewing Angle	Perfect Viewing Angle
Panel Bit Depth	10 bits	10 bits
Color Depth	1.07 Billion	1.07 Billion
Rec.2020 Color Space Coverage	75%	76%
DCI P3 Color Space Coverage	99%	99%
Brightness	400 nits	300 nits
Peak Brightness	800 nits	800 nits
Contrast Ratio	∞	∞
Input Lag	20 ms	21 ms

VIDEO	Sony KD-55AF9	Sony KD-55AF8
3D Capability
HDR10
HDR10+
Dolby Vision
Dolby Vision IQ
HLG
Advanced HDR by Technicolor®
IMAX Enhanced
AMD Freesync™
NVidia G-Sync
4K HFR
2K HFR
VRR
HGIG Compatibility
Picture Processor	X1™ Ultimate	X1™ Extreme
Frame Interploation Technique	Motionflow™ XR	Motionflow™ XR
Black Frame Insertion
Filmmaker Mode
X-Reality™ PRO	4K	4K
Dual database processing
Object-based Super Resolution
Live Color™ Tech0logy
Precision Color Mapping
Super bit mapping™ 4K HDR
Contrast Enhancement	Dynamic Contrast Enhancer	Dynamic Contrast Enhancer
Object-based HDR remaster
Pixel Contrast Booster
Auto Low Latency Mode

AUDIO	Sony KD-55AF9	Sony KD-55AF8
Speaker Type	Acoustic Surface Audio+™ (Actuator+Subwoofer)	Acoustic Surface Audio+™ (Actuator+Subwoofer)
Speaker Power Rating	13 W + 13 W + 13 W + 13 W + 13 W + 13 W + 10 W + 10 W	10 W + 10 W + 10 W + 10 W + 10 W
DSEE
Sound Processing	ClearAudio+	ClearAudio+
Clear Phase
Simulated Surround Sound	S-Force Front Surround	S-Force Front Surround
TV Center Speaker Mode
Dolby Atmos
Dolby Digital
Dolby Digital Plus
Dolby Pulse
Dolby AC-4
DTS Digital Surround
WiSA Ready

CONNECTIVITY	Sony KD-55AF9	Sony KD-55AF8
Ethernet Input
Ethernet Standard	10BASE-T/100BASE-TX	10BASE-T/100BASE-TX
Wi-Fi
Wi-Fi Frequency	2.4 GHz, 5 GHz	2.4 GHz, 5 GHz
Wi-Fi Protocol	802.11a/b/g/n/ac	802.11a/b/g/n/ac
Bluetooth
Bluetooth Version	4.2	4.1
Smartphone Connectivity	Chromecast built-in Video & TV SideView (iOS/Android)	Chromecast built-in Screen mirroring (Miracast™) Video & TV SideView (iOS/Android)
Chromecast
Google Home
Virtual Assistant	Google Assistant	Google Assistant
Works with Alexa
HDMI Inputs	4	4
HDMI Version	2.0b	2.0
HDMI Audio Return Channel (ARC)	eARC
HDCP Version	2.3	2.3
HDMI-CEC	BRAVIA Sync	BRAVIA Sync
USB Inputs	3	3
USB 3.0 Ports	1	1
RF (Terrestrial / Cable ) Inputs	1	1
IF (Satellite) Inputs	2	2
Component Inputs
Composite Inputs	1 via A/V 3.5mm input	1 via A/V 3.5mm input
RCA Audio Outputs
3.5mm headphone Audio Output
Optical Audio Output
RS-232C Remote
DLNA

OTHER	Sony KD-55AF9	Sony KD-55AF8
SoC	MediaTek MT5893	MediaTek MT5891
CPU	ARM Cortex-A73	ARM Cortex-A53
CPU Cores	4	4
CPU Frequency	1500 MHz	1100 MHz
GPU	ARM Mali-G71	ARM Mali-T860 MP2
RAM	4 GB	2 GB
Storage	16 GB	16 GB
Operating System	Android	Android
Internet Browser	Vewd	Vewd
Content Bar
Voice Command
Light Sensor
Electronic Program Guide (EPG)
Application Store	Google Play Store	Google Play Store
Teletext
Auto Calibration with CalMAN
Picture-In-Picture
Closed Captions	(Analog) (Digital) Subtitle	(Analog) (Digital) Subtitle
PVR Function
USB HDD Recording
USB Drive Format Support	FAT16 / FAT32 / exFAT / NTFS	FAT16 / FAT32 / exFAT / NTFS

VIDEO FORMATS	Sony KD-55AF9	Sony KD-55AF8
3GPP
AV1
AVI
ASF
DivX
Flash Video
H.263
H.264
H.265
MKV
M2TS
MP4
MPEG-4
QuickTime
RealVideo
TS
VC-1
VP7
VP8
VP9
VOB
VRO
WebM
WMV
Xvid

AUDIO FORMATS	Sony KD-55AF9	Sony KD-55AF8
AAC
AC4
AIFF
ALAC
APE
aptX
eAAC+
EAC3
FLAC
HE-AAC
LPCM
M4A
MIDI
MP2
MP3
OGG
RealAudio
WMA
WAV

IMAGE FORMATS	Sony KD-55AF9	Sony KD-55AF8
BMP
GIF
JPEG
JPS
MPO
PNG

TUNER	Sony KD-55AF9	Sony KD-55AF8
Digital Tuner	2	2
SAT Tuner
Analog Tuner	B/G,D/K,I	B/G,D/K,I
Digital Terrestrial TV System	DVB-T/T2	DVB-T/T2
Digital Cable TV System	DVB-C	DVB-C
Digital SAT TV System	DVB-S/S2	DVB-S/S2
Color system	PAL / SECAM / NTSC3.58 / NTSC4.43	PAL / SECAM / NTSC3.58 / NTSC4.43
CI+	1.3	1.3
FM Radio

GENERAL	Sony KD-55AF9	Sony KD-55AF8
Energy Efficiency	B	B
Power Supply	AC 220 V - 240 V, 50 Hz	AC 220 V - 240 V, 50 Hz
Power Consumption (Typical)	401 W	392 W
Power Consumption (In Standby)	0.5 W	0.5 W
Dimension Without Stand (W x H x D)	1228 mm x 711 mm x 86 mm 48-3/8" x 28" x 3-1/2"	1226 mm x 712 mm x 55 mm 48-3/8" x 28-1/8" x 2-1/4"
Dimension With Stand (W x H x D)	1228 mm x 709 mm x 320 mm 48-3/8" x 28" x 12-5/8"	1226 mm x 717 mm x 255 mm 48-3/8" x 28-1/4" x 10-1/8"
Stand Size	397 mm (15.63")	Width: 402 mm (15-7/8")
Dimension of Package (W x H x D)	1458 mm x 836 mm x 196 mm<57.40" x 32.91" x 7.72"	1354 mm x 832 mm x 185 mm<53-3/8" x 32-7/8" x 7-3/8"
One Connect Box
VESA Wall Mount
VESA Hole Pitch (W x H)	400 mm x 200 mm 15-3/4" x 7-7/8"	300 mm x 200 mm 11-7/8" x 7-7/8"
Weight Without Stand	23.8 kg (52.5 lbs)	18.7 kg (41.2 lbs)
Weight With Stand	30.0 kg (66.1 lbs)	22.2 kg (48.9 lbs)
Weight of Package (Gross)	38 kg (83.8 lbs)	29 kg (63.9 lbs)
Warranty	1 Year	1 Year

ACCESSORIES	Sony KD-55AF9	Sony KD-55AF8
Optional Accessories	Wall-Mount Bracket SU-WL450 (not supplied)	Wall-Mount Bracket SU-WL450 (not supplied)