24mm equiv

Hello

I am looking for a compact system and considering either m43 with 12mm or Sony nex 5N with a legacy 16mm lens

Question: what 16mm legacy manual focus lenses should i look into to get 24mm equiv focal length? I know that sony has a 16mm with AF but my understanding is that it has soft edges - any legacy lenses with good contrast and character you recommend?

thanks for your help