Yes, Oppo F11 has dual 4G sim support. You can use 2 sim cards on 4G networks at the same time without any trouble.
No. Oppo F11 does not have Dolby sound support.
No. Oppo F11 does not have the NFC sensor.
Yes, Oppo F11 does have support for the fast charging. The mobile comes with VOOC 3.0 enabled the fast charger. It charges almost 20% faster than the regular fast chargers available in other mobile phones.
You can record up to 1080p resolution HD videos on Oppo F11 rear camera. Additionally, you can also record up to 720p resolution videos with the front camera of the mobile.