I have used many phones, atleast for few days, S6 is one of them [emoji4].
But my primary phone is ALWAYS entry to mid range phone, for some very interesting reasons.
Light sensor calibration.
Btw, you already know it, but just posting it on the forum, so that someone else could benefit from it, as many people curse Quad HD display phones for awful battery timings.
S6 has over bright display, much brighter than competitors and excellent sunlight legibility. So it's a good idea to re-calibrate the light sensor to limit max brightness to 50% on auto brightness mode. It also helps a lot in improving screen on times, overall battery timings and reducing eye strain.
P.S, most phones have over bright display on auto brightness mode. Lux auto brightness is a good app for light sensor adjustments.