I had the chance to try the 70-300mm G and CZ 16-80mm at SonyStyle Wisma Atria. I give the overall experience and IQ of the CZ 16-80mm an OK.
But that G lens is something else, honestly it's my first time handling a G + SSM lens. Focusing is almost silent and the IQ and bokeh are :thumbsup:. Nevermind that it's not a constant aperture or fast lens, I now dare to shoot using ISO 1600 or 3200 after v4 on my A700 to compensate for low light condition up to a certain degree, of course. It's weight shouldn't be an issue for me as it's slightly heavier than my ALL-Metal Tokina 24-200mm.
Tried the A900 with a 16mm F2.8 and I wonder what's the fuss is about.
Further to add, the Sony staff was very kind to entertain to my request to test those lens. He even ask me to try the 2 great whites which I decline politely as those lens will only add to my misery and burn my pocket.
So, my take is - 70-300mm G is definitely a value for money lens.
And experience too, Like.n

ther, at that Sony store.