If the term "perfect" already very close!

October 2014 I switched from iOS to Android and first chose a Samsung S5.
Unfortunately, I was with the device not at all happy to me then the Hutschnur has burst and I have 2 months later ordered me OnePlus ONE.

Size, display, Design
The ONE provides with 5.5 "a noticeably larger screen, but at the same time the dimensions only down a little bit longer. This is because when the display occupies almost the ONE entire front and there is little margin around it. I think the Size optimally - it still fits nicely in your pocket practical.!
Also total the design and feel fit. The device feels very valuable. In contrast to S5 it is through the rough (stone-like?) Back very well and securely in your hand. The chrome frame makes a noble impression.

Battery life
Power consumption and battery life was the S5 really a vexed issue.
Now with the ONE keeps my phone two days at a time without recharging by (over 2 days running and still 8% battery).
Perfect!

Camera
Photo camera and front camera providing much better pictures!
When S5 was always the problem of focus. 7 of 8 photos were blurred, noisy and unusable.
Not so with the ONE ... simply draufhalten with the default app, snap, perfect!
In low light you can see noise here as well. While offering the ONE "only" 12MPixel but the pictures are much clearer and also show the Ranzoomen clear contours instead Mohnbrötchen mishmash.

Speaker / Music
The sound of the built-in speaker is the ONE rich a lot, because it is a solid processed Housing Body. At S5, the main speaker sits in the back and is covered by the back cover made of plastic - and just as it sounds also there is this annoying crackling in the headphones between two songs while also not ONE.

Performance
Although SoC 801 are installed with 2.5GHz in the ONE and in S5 the same Snapdragon ONE runs much faster and performant. Disadvantage of Samsung was here the patch TouchWiz interface, which has consumed a lot of system resources. In addition that the ONE 3GB instead of 2GB RAM has. (AnTuTu Benchmark> 48,000 points without any special modification).

Practical features
Gesture control in standby: Who needs short times a flashlight, can without the phone easy to unlock with your finger a V on the screen draw => Photo Lamp on / off - very convenient!
With a circle the way you start the camera - ideal for quick snapshots!

Software
Ex factory, the ONE is already shipped with Android 4.4.4 in the CyanogenMod version, the additional features and individual adjustment (Extensive display positions, Graphic Theme management etc.)

These OnePlus erlaub to rooten the ONE without the guarantee will be affected.
Thus, you can install without problems or check Ad Blocking, sniffing that APP's in the phone.
It's frightening how many are interested and want to know my home phone numbers APP's, with whom I call everything. With a rooted phone, you can retrieve its privacy here.

Disadvantages of One:
The ONE has indeed just a scratch-resistant surface from Gorilla Glass, but without Oilophobe coating.
Thus fingerprints are clearly visible. In practice, however, does not interfere.

The AMOLED display of the S5 lights much brighter and more saturated colors. At ONE, however the color is natural. Here, everyone has to decide according to his personal taste.

A fingerprint sensor and an infrared transmitter to operate at TV and other equipment does not have the ONE also. But I can live with.

For me was crucial:
1. Camera quality
2. Great battery life / ENERGY EFFICIENCY
3. Processing and tangibility
4. Good performance

In total, the ONE is why my clear winner.