Here it is again without HDR. The Auto HDR mode didn't always snap on when it should have -- I had to manually turn it on to avoid an overexposed background or an underexposed foreground. Apple's HDR is much more sensitive.
This shot taken in Barcelona really showed off the camera's low-light prowess. I couldn't quite get the iPhone 6S Plus I had with me to properly adjust for the darker scene. There's still noise, but you don't lose out on much detail, and you can still clearly see people in the far background.
Selfies taken with the front 4-megapixel camera don't have the highest resolution, but you'll end up looking good, thanks to Xiaomi's Beautify modes that help hide blemishes (hey, no jokes about it working overtime on me).