OnePlus was careful not to set off a runaway hype reaction for the 3T - we've seen people's opinions turn sour when a phone can't live up to the impossible hype. That was good, but is the OnePlus 3T underwhelming? The chipset was upgraded from Snapdragon 820 to 821, which brings small improvements to performance and battery life. Speaking of, the battery now has 3,400mAh capacity (up from 3,000mAh) without affecting the thickness and weight of the phone. The OnePlus 3T selfie camera is now a 16MP shooter, though it has smaller pixels than the 8MP camera it replaces - 1µm from 1.4µm....
Source: http://www.gsmarena.com/weekly_poll_oneplus_3t_an_amazing_upgrade_or_needles_price_hike-news-21703.php