LG Aristo 4 Plus vs LG K40 – Detailed comparison lmx320ta vs lmx420mm

LG Aristo 4 Plus and K40 are the latest entrants in the Aristo Series and K Series respectively. K Series is a level higher than the Aristo series. In the MetroPCS / T-Mobile smartphones lineup, the Aristo series falls at the bottom of the ladder with the bare basic features.

In this post, we are going to compare K40 & Aristo 4 Plus in great detail to find out which one suits you better. We are going to deal with the differences at first and will cover the similarities afterward. So let’s get going –

Difference between LG Aristo 4 Plus & LG K40

1. Release Date & Price – Difference between LG Aristo 4 Plus & LG K40

Model NumberLM-X320TALM-X420MM / LM-X420TM
Release DateSeptember 2019Feb 2019
Current PriceAround $70Around $85

Both Aristo 4 Plus and K40 were released in the year 2019. First K40 came in the month of February and by the end of the year, Aristo 4 Plus was released in September. Earlier only the T-mobile version of Aristo 4 Plus was released but now it’s available for MetroPCS as well.

The below images show the recent prices of Aristo 4 & K40. You can click on the screenshot to find out the current price.

LG Aristo 4 Plus Price
LG Aristo 4 Plus Price (as on Feb 12, 2020)

LG K40 Price
LG K40 Price (as on Feb 12, 2020)

2. Build & Design – LG Aristo 4 Plus vs LG K40

LG Aristo 4 Plus vs LG K40 - Front
LG Aristo 4 Plus (Left) & LG K40 (Right)
LG Aristo 4 Plus vs LG K40 - Back
LG Aristo 4 Plus (Left) & LG K40 (Right)
BUILD & DESIGN – The DifferencesLG Aristo 4 Plus LG K40
ColorsPlatinum GreyAurora Black
Dimensions5.78 x 2.81 x 0.33 (146.8 x 71.4 x 8.4 mm)6.02 x 2.83 x 0.32 (153 x 72 x 8.1 mm )
Weight5.3 oz (150.2 gm)5.1 oz (144.6 gm)

Both Aristo 4 & K40 come in gray color with a slight difference as evident in the above image. LG K40 has a shiny surface while Aristo 4 has a matt feel.

The width of the 2 phones is almost the same but K40 stands a bit taller. Even though K40 is bigger in size, it doesn’t feel so while holding the 2 phones together due to a similar width. They both offer a decent grip.

3. Display / Screen – LG K40 vs Aristo 4 Plus

LG Aristo 4 Plus vs LG K40 - Display
LG Aristo 4 Plus (Left) & LG K40 (Right)
DISPLAY / SCREEN – The DifferencesLG Aristo 4 Plus LG K40
Screen Size5.45 inches5.7 inches
Contoured / Curved Edge / 2.5D Glass

Aristo 4 Plus and K40 are the first phones in their respective series to employ an 18:9 aspect ratio screen. This Aspect ratio offers more screen estate with thinner bezels.

LG K40 has a 2.5D curved-edge glass. Aristo 4 plus comes with flat glass.

While the screen resolution of both phones is the same, K40 is fitted with a bigger 5.7 inches display as opposed to 5.45 inches screen on Aristo 4 Plus.

The T-Mobile variant of Aristo 4 Plus and K40 comes with Panda Glass Screen Protection.

4. Connectivity & Storage – LG Aristo 4 Plus vs K40

NFC / Android Pay / Android Beam
Internal Storage/Memory/ROM16 GB (Usable 8 GB)32 GB (23.65 GB Usable)

LG K40 is the first K series smartphone with the NFC feature. It allows contactless payments via Android Pay / Google Pay etc.

Aristo 4 Plus lacks NFC.


LG Aristo 4 Plus vs LG K40 - Internal Storage
LG Aristo 4 Plus Internal Storage (Left) & LG K40 Internal Storage (Right)

The internal storage capacity of LG K40 (32GB) is twice that of the Aristo 4 Plus (16GB). However, the usable space is much lesser. Out of 16 GB, only 6.41 GB is available on Aristo 4 Plus. K40 offers 17.89 GB of free usable space out of 32GB.

You can refer to the above screenshot. I’ve taken these screenshots after doing a factory data reset. The storage space consumed by the “Other apps” attribute to the pre-installed system apps.


5. Camera & Additional Features – LG Aristo 4 vs K40

CAMERA & ADDITIONAL FEATURES - The DifferencesLG Aristo 4 Plus LG K40
Front Camera Flash / Selfie Flash

Notification LED Light

LG K40 Selfie Flash
LG K40 Selfie Flash

Both LG K40 and Aristo 4 Plus have a 13MP rear and 5MP front camera. There is hardly any difference in image quality. Both the cameras offer PDAF. The only difference lies in the Front Camera Flash.

A Selfie Flash is introduced for the first time in a K series smartphone. Aristo 4 Plus lacks a Front Camera Flash.

LG K40 Notification LED
LG K40 Notification Light

LG K40 is also the first K series smartphone to employ a Notification LED for incoming calls and messages. This was a long-needed feature. Notification light is missing from LG Aristo 4 Plus.

6. Hardware – LM-X320MA vs LM-420MM

HARDWARE - The DifferencesLG Aristo 4 Plus LG K40
Processor/CPU1.4 GHz Quad-Core1.8 GHz Octa-Core
Chipset 28nm, Qualcomm Snapdragon 425 MSM891714nm, Qualcomm Snapdragon SDM450
GPUAdreno 308Adreno 506
LG Aristo 4 Plus vs LG K40 - Hardware
LG Aristo 4 Plus (Left) & K40 (Right) – Hardware Specs

LG K40 is the first K series smartphone with respectable specs and features. The changes are evident in the hardware department as well. It uses a Qualcomm Snapdragon 1.8 GHz Octa-Core Processor which is also found in LG Stylo 5.

Aristo 4 Plus comes with the age-old Qualcomm Snapdragon 425, 1.4 GHz Quad-Core CPU. This same processor is found in Aristo 1, Aristo 2, Aristo 3 and now Aristo 4 Plus. Aristo 4 Plus would have been a much better phone with more powerful hardware.

7. Benchmark Test – LG K40 vs Aristo 4 Plus

Antutu Score5649789590
Geekbench Test
Single-Core Score661720
Multi-Core Score18843676
LG Aristo 4 Plus vs LG K40 - Antutu Benchmark Test
LG Aristo 4 Plus (Left) & K40 (Right) – Antutu Benchmark Scores

LG K40 leads the Anutu benchmark score by a huge margin. Thanks to its 1.8 GHz Octa-Core CPU.

LG Aristo 4 Plus vs LG K40 - Geekbench Test
LG Aristo 4 Plus (Left) & K40 (Right) – Geekbench Scores

There is a huge variation in the Geekbench Muti-Core score between the 2 phones. After all, K40 comes with an 8 core CPU as opposed to 4 core CPU on Aristo 4 Plus.


Similarities between LG K40 & LG Aristo 4 Plus

What's Common between the twoSIMILARITIES
BUILD & DESIGNLG Aristo 4 Plus & K40
Body MaterialPlastic
Removable Battery
Memory Card Slot/Expandable MemoryUp to 2 TB
PHONE LAYOUTLG Aristo 4 Plus & K40
Power ButtonRight
Loudspeaker GrillBottom
Fingerprint SensorBack
Headphone JackBottom
Sim Card Slot / Memory Card SlotLeft
Google Assistant KeyLeft
DISPLAY / SCREEN LG Aristo 4 Plus & K40
Aspect Ratio18:9 ratio
Screen Resolution/Wallpaper Size1440 x 720 pixels
Display Type/TechnologyIPS LCD
Gorilla Glass/Glass Screen ProtectionPanda King Screen Protection (T-Mobile variant)
Pixel Density282 ppi
NETWORKLG Aristo 4 Plus & K40
Carrier / Service ProviderMetroPCS / T-Mobile
Sim Size/TypeNano
GSM Unlock StatusLocked
Wifi Calling
SENSORSLG Aristo 4 Plus & K40
Gyroscope/VR Compatibility
Magnetometer/Digital Compass
Fingerprint Sensor
Ambient Light Sensor
Proximity Sensor
CONNECTIVITYLG Aristo 4 Plus & K40
USBMicro USB 2.0
Wifi Tethering
Screen Mirroring / Miracast
MHL / Slimport / HDMI Compatible

IR Blaster / TV Remote
FM Radio
3D Surround Sound
Quick Charge / Fast Charging
Wireless Charging / Qi-enabled
MEMORY/STORAGELG Aristo 4 Plus & K40
Expandable Memory
Maximum SD card capacity/SD card sizeUp to 2 TB
SOFTWARE LG Aristo 4 Plus & K40
Android VersionAndroid 9.0 Pie
User InterfaceLG UX 7.0
Face Unlock / Facial Recognition
Google Assistant
Multi-Window / Split Screen / Multitasking Support
CAMERALG Aristo 4 Plus & K40
Image Resolution / Megapixels13 MP

Phase Detection Auto Focus (PDAF)

FlashSingle LED Flash
ZoomUp to 4x, Digital
Video Resolution1080p @ 30 fps
Face Detection
Manual Mode / Controls
Slow Motion
Time Lapse
Video Stabilization
Megapixels5 MP
Video1080p @ 30 fps
Portrait Mode with background blur effect
BATTERY LG Aristo 4 Plus & K40
Capacity2890 mAh
ROOT STATUSLG Aristo 4 Plus & K40
Root Compatible
Bootloader Unlock Compatible
Custom Rom Available

The above table shows the features which are common between Aristo 4 Plus and LG K40. It also marks those features which are not present in either of the phones and can be found in some other higher-end smartphone.

Both Aristo 4 Plus and K40 have a Fingerprint sensor, Face unlock, Android Pie 9.0, Expandable Memory, 13MP Rear camera, Phase Detection AutoFocus, 5 MP Front Camera, Google Assistant Hard Key, IPS display, Wifi Calling, FM Radio, Gyroscope, Magnetometer, USB OTG support & 2890 mAh battery.


From the above comparison, it’s pretty clear that K40 leads by a huge margin. Its a much better phone as compared to Aristo 4 Plus. By paying a little more you’re getting a much more superior smartphone.

The gap between the Aristo series and K series widened with the arrival of LG K40. It’s a true K30 successor. Aristo 3 and K30 were not that far apart in competition.

In the nutshell, these are the areas where LG K40 wins over Aristo 4 Plus –

  • Better Look and Feel (Thanks to the shiny surface)
  • Bigger Display with 2.5D Glass
  • NFC
  • Notification LED Light
  • Internal Storage Capacity (32GB vs 16GB)
  • More powerful Hardware (1.8 GHz Octa-Core vs 1.4 GHz Quad-Core)
  • Selfie Flash / Front Camera Flash

What are your thoughts? Please share it via the comment section below. Feedback is welcome.

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