LG, for most of its past flagship devices had plastic bodies unlike Samsung and Sony whose smartphones had metal builds. Rumor has it that the LG G5 could sport a metal unibody design.
Samsung has been criticized heavily in the past for its plastic body phones. However, Samsung went ahead with metal and glass build this year for its high end phones like the Galaxy Note and the Galaxy S series. Samsung has made several improvements to the build to many of its mid range and lower end handsets.
LG on the other hand has made its flagship phones far more fashionable by providing leather back covers, removable battery and microSD card slot. Leather covers have become a trend now with some flagship phones as they are highly fashionable. However, LG's sales numbers for some of its previous smartphones did not prove the point and that is why LG is trying something new with the G5. The G5 is most likely to have a metal unibody design.
The metal unibody will most likely give the LG G5, an edge over other Smartphone flagships. It is also likely that the G5 specs will have specifications that are on par with other Flagships. For LG the G5 will be another phone that takes design to the next level and compete with phones from other flagships.