For smartphone users, here are the features of Samsung Galaxy S4 vs Galaxy S3.  Pretty sure that the S4 far outpaces the latter but it's worth knowing what areas they differ:

Samsung Galaxy S3 specifications

• Weight: 133 grams


• Screen size: 4.8 inches


• Pixel density: 306 ppi


• Internal Storage: 16, 384mb


• Card Storage: 64GB max


• Operating System: Android


• Operating System Version: Android 4.1


• Networks:
  
  
  
  
  
  
  
  
  
  
  
  
  

  3G (HSPDA/CDMA)

  4G (LTE/HSPA+)

  Edge/2G (GSM/GPRS)

  
  

• User Interface: TouchWiz


• CPU speed: 1.4 GHz /4 cores


• CPU: Exynos 4212 Cortex-A9


• Dimensions: 5.38" x 2.78" x 0.34"


• Talk Time: 22hours


• 
  
  Battery Capacity: 2,100 mAh


• Battery Technology: Li Ion


• 
  
  Features
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  DLNA

  FM Receiver

  GPS Navigation

  Graphics Accelerator

  HD Playback

  Microphone

  
  


• 
  
  Keypad Options: Touch Screen Keypad


• Sensors
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  Accelerometer

  Barometer

  Digital Compass

  GPS

  Gyroscope

  
  


• Removable Memory
  
  
  
  
  
  
  
  
  
  

  microSD

  microSDHC

  
  


• Display Technology: Super AMOLED


• Screen Resolution: 1,280 x 720 pixels


• 
  
  Display Features
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  Additional Display Support

  Ambient Light Sensor

  Multi Touch

  Proximity Sensor

  Scratch Resistant Glass

  
  


• 
  
  Charging Connection: microUSB


• Interfaces
  
  
  
  
  
  
  
  
  
  
  
  
  

  HDMI (via microUSB)

  microUSB

  USB

  
  


• Camera: 1.9MP (front) / 8MP (rear)


• amera Options
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  Autofocus

  Burst Mode

  Digital Zoom

  Front Facing Camera

  Image Stabilization

  LED Flash

  Panorama

  Rear Facing Camera

  Video Recording

  
  


• 
  
  Maximum Video Capture Resolution: 1080p


• 
  
  Headphone Connection: 3.5mm


• 
  
  Wireless Connectivity: Compare by Wireless Connectivity
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  3G

  4G

  Bluetooth

  Mobile Hotspot Tethering

  NFC

  WiFi

  
  


• 
  
  Bluetooth Version: 4.0

 

Samsung Galaxy S4 specifications

• Weight: 130 Grams


• Screen size: 4.99 inches


• Pixel Density: 441 ppi


• Internal Storage: 16,384MB


• Card Storage: 64 GB


• Operating System: Android


• Operating System Version: Android 4.2


• Networks
  
  
  
  
  
  
  
  
  
  
  
  
  

  3G (HSPDA/CDMA)

  4G (LTE/HSPA+)

  Edge/2G (GSM/GPRS)

  
  


• User Interface: TouchWiz


• CPU speed: 1.6 GHz / 8 cores


• CPU: Exynos 5 Octa (1.6-1.8 GHz quad-core ARM Cortex-A15 and 1.2 GHz quad-core ARM Cortex-A7)


• Dimensions: 5.38" x 2.75" x 0.31"


• 
  
  Features
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  DLNA

  GPS Navigation

  Graphics Accelerator

  HD Playback

  Infrared Blaster

  Microphone

  
  


• 
  
  Keypad Options: Touch Screen Keypad


• Sensors
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  Accelerometer

  Barometer

  Digital Compass

  GPS

  Gyroscope

  Humidity

  Thermometer

  
  


• Removable Memory
  
  
  
  
  
  
  
  
  
  

  microSD

  microSDHC

  
  


• Talk Time: 14 hrs


• 
  
  Battery Capacity: 2,600 mAh


• Battery Technology: Li Ion


• Display Technology: Super AMOLED


• Screen Resolution: 1,920 x 1,080 pixels


• 
  
  Display Features
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  Additional Display Support

  Ambient Light Sensor

  Multi Touch

  Proximity Sensor

  Scratch Resistant Glass

  
  


• 
  
  Camera Options
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  Autofocus

  Burst Mode

  Digital Zoom

  Dual Camera Record

  Front Facing Camera

  Image Stabilization

  LED Flash

  Panorama

  Rear Facing Camera

  Sound & Shot

  Video Recording

  
  


• 
  
  Maximum Video Capture Resolution: 1080p


• 
  
  Charging Connection
  
  
  
  
  
  
  
  
  
  
  

  microUSB

  Wireless

  
  

• Interfaces
  
  
  
  
  
  
  
  
  
  

  HDMI (via microUSB)

  microUSB

  
  


• 
  
  Headphone Connection: 3.5mm


• 
  
  Wireless Connectivity
  
  Compare by Wireless Connectivity
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

  3G

  4G

  Bluetooth

  Infrared

  Mobile Hotspot Tethering

  NFC

  WiFi

  
  


• 
  
  Bluetooth Version: 4.0