Like it or not, you can't deny that the Samsung Galaxy S6 is a sizeable upgrade over the Galaxy S5. The new flagship from Samsung may still not carry a memorable design, but it's more powerful and offers a lot more over its predecessor. In fact, Samsung could teach HTC a thing or two about 'upgrading' flagships. Here's a side by side view of the Galaxy S6 and S5 to see what's changed.
Display
Speaking about size, the display remains at 5.1 inches, but the Galaxy S6 has a Quad-HD display compared to the 1080p on the S5. This could either be very good or very bad, depending on your personal preference.
Power
According to Samsung, the new Exynos 7 Octa SoC in the S6 is more powerful than the Qualcomm Snapdragon 810. Whether that is true will be tested later, but it is definitely way ahead of the Exynos 5 Octa that powered the Galaxy S5.
RAM
2GB of RAM used to be enough for a smartphone sometime ago, but we need more now. Hence, the Galaxy S6 has 4GB of RAM, which offers more software compatibility and mutitasking.
Camera
The rear shooters on both these devices have 16MP sensors, but the S6 boasts Optical Image Stabilisation. The addition of OIS makes a world of difference, especially for low light conditions. Also, the front camera has been expanded to 5MP from the 2MP on the S5.
Waterproofing
The one thing that the S5 had and the S6 doesn't is the IP67 certification. How important that is will again depend completely on the user. So, like swimming?
Storage
Ok, yes, the Galaxy S6 doesn't have expandable storage. It comes in 32GB, 64GB and 128GB variants. With the right pricing, Samsung could make this work, but looking at its track record, we wouldn't be very certain. That said, 32GB is more than enough storage for a smartphone and Samsung made a wise choice by not pushing out a 16GB version.
Battery
Samsung says that while the features have all improved, they have also become more battery efficient. This shall be judged after a full review, but for now, the Galaxy S6 has a smaller 2550 mAh battery, compared to the S5's 2800 mAh.
Slimness
The S5 was quite thick at 8.1 mm, but Samsung has since moved to slimmer profiles. The Galaxy S6 is right up there with its slimmest devices, at only 6.8 mm.
Wireless Charging
According to Samsung, the S6 brings wireless charging done right. The Galaxy S6 can apparently work with any wireless charger and also supports fast charging.