Nex-5N, can i get better shots?
The first set of photos aren't focused on the wave, but on the water behind the wave. It's the photographer
On the Nex-7 and the Nex-5N the focus will be on the first beginning of the wave. Then, in burst mode, the waves will roll towards you and will eventually leave the focal plane.
Best is to use MF (pre-focus) or a higher f-stop, and shoot in burst mode.
On the Nex-6, and 5R, there is an app with focus bracketing, that may work, but I haven't played with it yet.
The waves are very repetitive, so it makes for a good practice subject.