So on the following two pages I want to show you a couple of in-game screenshots. First up a quick comparison in-between AMD Radeon and NVIDIA GeForce graphics cards.
In the screenshot below we have the Image quality setting at very high and are in a screen resolution of 2560x1600 pixels.
This is the reference screenshot, the square in the middle is where we'll zoom in at:
To your left NVIDIA GeForce GTX 580, and to the right AMD's Radeon HD 6970. Due to lapses in time here and there a wave will look different etc but other then that we have a hard time deciding if we can see any noticeable rendering differences. Mind you that these are JPEGs, compressed images aren't lossless.