OnePlus 2 vs OnePlus One: should you upgrade?
Same design language, slight facelift
The OnePlus 2 looks very similar to its predecessor. The updates to its body include a slightly different camera module (to house the laser focus sensor), a metal frame with a speaker grille on its bottom, and a touch-type fingerprint sensor home button at its front. As far as dimensions go, the OnePlus 2 is slightly thicker and ever-so-slightly heavier than its predecessor, which may be a bit of a letdown.
Display
Again, not much has changed. While we don't have access to display measurements as of yet, on paper, both screens seem pretty similar – a 5.5” panel with a 1080 x 1920 resolution adorns both the old and the new handsets. Of course, this is in no way a bad thing – the display on the OnePlus One did not disappoint, aside from being slightly on the bluish side. We like the fact that OnePlus didn't jump on the Quad HD bandwagon and kept the 1080p resolution for its new phone – we hope this will mean good things for the battery life. On the flip side, if you have been waiting for a beyond-crisp resolution to convince you to upgrade your One – we're sorry, but you won't find that on the OnePlus 2.
New UI
OnePlus and Cyanogen fell out of love some time last year, as the software developer signed an exclusive deal with India-based Micromax, just as OnePlus was trying to push into the country's market. This sparked a mini drama between both companies and eventually led to OnePlus gathering its own team to program a home-brewed UI for its new devices.
All in all, it looks like a jump from Cyanogen OS to OxygenOS will not feel too different or uncomfortable. Still, due to the fact that the latter is still new and probably unstable, we'd suggest holding off on purchasing before some more reports of the system's performance become available.
64-bit processor and 4 GB of RAM
Something that definitely sets the OnePlus 2 apart is its 4 GB of RAM. Certainly a rarity among smartphones nowadays, and we'd say it definitely adds a sense of future-proofing to the device. We assume that this amount of memory will be the norm among flagships in 2016, but for this year – OnePlus 2 is certainly a rare monster.
Camera
Both phones sport a Sony IMX214 13 MP sensor with an F2.0 aperture. The OnePlus 2, however, adds OIS and laser autofocus, so it's the clear winner here. Initial camera samples and comparisons are pretty impressive and we'd say that if a top-notch camera is the driving force behind your upgrade decisions, then you should definitely go for the OnePlus 2.
Fingerprint sensor
It's pretty clear-cut here – the OnePlus 2 has it, the OnePlus One does not. If you want to be a part of the cool-boys-with-fingerprint-scanners club, an upgrade is the clear choice for you. The OnePlus 2 sports a touch-type button on its front, which can also be customized to do various actions as you tap on it (it can do Samsung's double-tap for camera, but it can do anything else you set it to as well).
Conclusion
In all fairness, there isn't enough in the OnePlus 2 to warrant an upgrade from the One. Casual users, or even slightly more tech-engaged aficionados, will not feel inclined to ditch their old Flagship Killer just yet. This doesn't make the OnePlus 2 a bad device at all. It will definitely be alluring for hardcore fans, full-on tech heads, and newcomers to the brand, though, it's missing some of the high-tech flair, such as wireless charging, quick charging, and NFC. If anything, this comparison has shown us that the OnePlus One is still a pretty adequate device that can easily take you through 2015, as long as you don't insist on owning the newest piece of equipment from the company.
Things that are NOT allowed: