We have a few camera samples from each phone to share below, please click to see the full-sized image. To keep the pictures at a similar resolution, the OnePlus One pictures were taken at 7.7MP, whilst the Xperia Z2 pics were taken at 8MP. Have a look at the samples and let us know which ones you prefer.
Camera shootout: OnePlus One (left) versus Xperia Z2 (right)
– Click to enlarge
Bricks
Bush
Flower
Fruit
HDR enabled
Toy police car
SpongeBob