Early Gen vs Late Gen and Optimizations(Why launch games will not look the best)

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The differences between early and late gen for PS4/Xbone will not be as dramatic as with PS3 and 360 because the newer systems much easier to develop for off the bat, but as with any gen there will be a noticeable upgrade over time.
Same goes for Wii U; we will see games on it later on that put anything released so far to shame technically.