On camerageek website DPReview they always do very serious tests, and the Web community reacts very seriously. Verdict on studio pictures made with the Sony A77: the experts do not all agree (otherwise they would not be experts), but there seems to be a majority opinion that the Sony A77 has great performance for a camera of its size and price. In fact, it can hold out with the best cameras at any price, give or take a pixel here or there. Except when it gets dark: then the loss of light through the new semi-translucent mirror results in more noise, less sharpness.
Sadly, the (excellent!) comparison tool on the DPReview site does not include samples made with my current camera, because that is of course the real question: I am not considering buying a whole new system from any camera brand, I am just considering if it is worthwhile to upgrade from my current Sony A700. And then even without direct comparisons there is little doubt: this is going to be a huge improvement! When can I get it....?