Plus, note that it is you who pointed out that the Samsung 30mm f2 lens is heralded to be better or sharper than the other offering by Sony, Panasonic and Olympus. The question is... heralded by who? The two websites that you brought out didn't show anything of that nature.
The website that I have read, did do a comparism between them. And the result is that Sony had a better lens here.
Next... the website that I am pointed to also noted that Olympus/ Panasonic had a larger lenses selection. Sony has the fewest in this department.
However I note that Sony NEX can use an adapter to allow the NEX to use Alpha lens too... so the selection can be quite large. I doubt Samsung has this ability.