2. The display is big and gorgeous and full of pixels

LG G3 display

A 1080p has been the high-water mark for a couple years now. That is, a 1080p screen, usually referred to as "HD," has a resolution of 1,920 pixels by 1,080 pixels — that's just over 2 million pixels in total. And that's a lot of pixels in a 5-inch space.

LG has gone even further with the G3, giving us the first QHD (as in quad-HD, or four times normal 720p HD) display. That's 2,560 pixels on the long end, and 1,440 on the short end, for a little less than 3.7 million pixels — again, all crammed into a 5.5-inch space. That's not easy to do, but the end result is that images and text are a crisp as they possibly can be. This is where we get into "pixels per inch." The LG G3 sports 538 pixels per inch.

Again, for comparison's sake, the Samsung Galaxy S5 has 432 ppi at 5.1 inches. The iPhone 5s and its "Retina" display is 326 ppi, but at a mere 4 inches. We've also seen 720p displays over the past that have been perfectly usable, albeit in smaller screen sizes.

Will you notice? That's up for debate. "It looks absolutely amazing," our own Alex Dobie said. But it's "going to be wasted on most apps, and if we're honest, most movies and videos, too. But photos games look really great on the G3's display."

The other caveat — and this is one that we're still testing — is that it takes power to push that many pixels, both in terms of the phone's graphics processor, and in its impact on the battery.