tldr
**LG G3 over Xperia Z2
**Bigger screen - 5.5" vs. 5.2"
Higher resolution screen - 1440p vs. 1080p
Higher CPU clock speed - 2.5GHz vs. 2.3GHz
Improved low-light laser-assisted auto focusing
Optical image stabilization
Dual-LED true-tone flash
32GB of built-in storage is an option
IR blaster
The back cover has wireless charging support
**Xperia Z2 over LG G3
**IP58 certification for dust and water resistance
Bigger, higher resolution camera sensor - 1/2.3" 20.7MP vs. 1/3" 13MP
More RAM - 3GB vs. 2GB (on the 16GB LG G3)
1080p@60fps and 720p@120fps video recording
Stereo speakers
Bigger battery - 3,200mAh vs. 3,000mAh
ANT+ support
Noise cancelling headphones in certain retail bundles
http://www.gsmarena.com/lg_g3_vs_sony_xperia_z2-review-1100.php
tldr
**LG G3 over Xperia Z2
**Bigger screen - 5.5" vs. 5.2"
Higher resolution screen - 1440p vs. 1080p
Higher CPU clock speed - 2.5GHz vs. 2.3GHz
Improved low-light laser-assisted auto focusing
Optical image stabilization
Dual-LED true-tone flash
32GB of built-in storage is an option
IR blaster
The back cover has wireless charging support
**Xperia Z2 over LG G3
**IP58 certification for dust and water resistance
Bigger, higher resolution camera sensor - 1/2.3" 20.7MP vs. 1/3" 13MP
More RAM - 3GB vs. 2GB (on the 16GB LG G3)
1080p@60fps and 720p@120fps video recording
Stereo speakers
Bigger battery - 3,200mAh vs. 3,000mAh
ANT+ support
Noise cancelling headphones in certain retail bundles