We haven't seen many comparisons between current and next generation platforms with some of the newer games coming out, but there's a comparison of Watch Dogs on the current generation consoles, put up against the next-gen platforms.
As you can see from the shots above and below, there are some big differences between the two versions. The shot above showed off a much more detailed image with increased clarity, shadow and lighting detail and more. You can really see the change in graphics between the two shots. If you look at the jacket Aiden is wearing, you can clearly see the big difference in detail.
The shot above, is also a good example, but I think most of the detail is blurred from our vision thanks to the darker scene. One part that really sticks out to be is the jumper Aiden is wearing underneath his jacket, with the detail at the top of it nice and clear. You can distinctly tell there's some bumps between the top, thanks to the improved level of detail, lighting and shadows.