Both phones are jam-packed full of shooting modes and options, such as an impressive Bokeh effect on the Galaxy S6 and a gesture shot on the LG G4, which takes four selfies in quick succession. Both also have pro modes (or Expert mode as it's called on the LG G4) with a selection of manual controls.
On paper the LG G4's snapper sounds better in a number of ways, for example its Panorama mode takes 104MP shots, while the S6's takes 60MP photos, but the Galaxy S6's camera is hugely impressive, so we'll reserve judgement until we've properly tested the G4's.
The selfie wars are ongoing, with the LG G4 looking promising there too, with an 8MP camera to Samsung's 5MP one.
As great as the Samsung Galaxy S6 is its battery disappoints. At 2550mAh it's not massive, in fact, it's smaller than the battery in the Galaxy S5. It's also slightly underwhelming in practice as while you'll get a full working day of moderate use out of it you'll probably be charging it most nights.
The LG G4 on the other hand has a much more reasonable 3000mAh juice pack and while it's got to power a larger screen LG reckons it should be able to last for up to 19.5 hours of talk time, which is pretty good if true, so there's a good chance it's got the Galaxy S6 beat. Plus while the S6's battery is sealed in the G4's is removable. Win.
The rear key is one of the biggest features of the LG G4, as it was on the LG G3 and the LG G2. It's designed to be easier to reach than the more conventionally placed buttons on the Samsung Galaxy S6 and most other phones.
But the Samsung Galaxy S6 arguably has more stand-out features. There's the amazingly accurate fingerprint scanner for one, which is set to get even more useful once Samsung Pay fully launches.
The Galaxy S6 also has a heart rate monitor, though we can't shake the feeling that it's a bit of a gimmick.
The LG G4 doesn't have as much in the way of hardware features, but both companies have given their phones UI's a long hard look, with Samsung stripping TouchWiz down to make it cleaner and more intuitive, while LG has packed in more features, like Smart Board, which aims to save you from jumping between apps by presenting key information from several of them on a single widget.
If we're talking sales the Samsung Galaxy S6 is always going to be the winner. It's a bigger brand with a bigger marketing budget.
But the LG G4 stands up well to it on paper, with a similar screen resolution (if not sharper), a theoretically better camera, a bigger battery and a microSD card slot, which the Galaxy S6 lacks.
Like the S6 the LG G4 also sports a premium design, which largely fixes one of the biggest problems of its predecessor - although leather is going to be a divisive material of choice.
But the Samsung Galaxy S6 may still have it beat on power and it arguably has a more compelling feature set - this is a battle that's set to rumble on.