One of my friend has recently purchased the Lenevo Vibe S1, and it is the best phone you can get in 16k at this time.
Vibe S1 comes with MediaTek MT6752 chipset, octa-core processor clocked at 1.7GHz, bundled with 3GB of RAM. Due to this, you get ultimate gaming experience. Even GTA San Andreas ran in high graphics without even a single lag or frame drop. The graphics are just awesome as the device is equipped with a 5" full HD IPS panel.
There are absolutely no heating issues. There may be a little warmth after playing heavy games, but that is natural.
The main attraction in this device is the **Dual Selfie Camera**. The dual camera is a combination of 8mp+ 2mp dual cameras. The 8MP camera takes quite decent pictures and the 2MP camera analysis the depth, allowing you to add some amazing effects to your picture. The front 13 MP camera is also very good.
So if you need a phone in 16k with optimum performance, very decent camera and stylish design, surely go for this device.