Need suggestions on wide angle for Nex-7

Thank you for the suggestions.

I am looking for prime lens, and the Sigma which is equivalent to 28.5mm is not wide enough for me. I prefer 24mm or wider.

Currently, I have a Nikkor 14-24mm G, so as soon as my Nex-7 arrives I will be reporting back on the performance. Obviously, this Nikkor is a monster and I prefer a RF size prime for traveling.

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Stik