I got a chance wrap my fingers around both the DualShock 4 and Xbox One controller at E3, and I must say, I was shocked at how different the new PlayStation controller felt. The DualShock 3 is quite a bit smaller than the new controller, while the Xbox One control pad is relatively the same in size as its predecessor.
Techradar has comparison images that illustrate this point. Give them a look below.
DualShock 3 vs. DualShock 4:
Xbox 360 vs. Xbox One:
Chinese site Weibo (via Gamechup) posted the following side-by-side comparison of the two next-gen controllers. You'll notice that the DualShock 4 is quite beefy and large.