We use our cameras on dry land at nighttime also so you may want to factor high-ISO performance in the decision if it's important to you. Currently, the NEX IQ is clearly superior to other mirrorless systems.
If you are into video, you may also want to consider NEX-5N and NEX-7 - the only two mirrorless cameras with 1080 60p video. With other mirrorless systems, you have to sacrifice 1080 resolution for 60P smoothness, and vice versa. Keep in mind that James Cameron wants to shoot Avartar 2 and 3 in 60 frames per second and this can be the beginning of the end of the outdated 24fps film standard that filmmakers actually hate. It's a certainty that 1080 60p will become the default video standard for consumer cameras and camcorders in the near future. Why wait?
Adjusting White Balance on the NEX-5N is simple and the results are pretty encouraging. There's no RAW for video, so adjusting WB at the scene is the only way to obtain the most accurate colors for movies... AND STILLS ALSO.

I have an in-progress "Personal-Observation" page on the NEX-5N here for those who are interested.