It may not be the exact same sensor but ability wise is should be on par.
No - in a very big way.
The Sony F3/FS100 sensor was designed "from the ground up" as a 1080 video sensor -- and that's the entire reason it's a very, very serious competitor to the AF100 and (with S-Log upgrade) even the Red One and Alexa (newest report from Abel Cine says 13.5 stops of latitude with the S-Log upgrade). Meaning -- if you took still photos with the F3/FS100 sensor -- you'd end up with two or so megapixel images. It's precisely because of the exclusively video optimized sensor that you're getting "big pixels" that inspire people to say things like "this thing can see in the dark."
I'm not a Sony fan -- actually I've been a Sony basher for nearly a decade -- but in this particular situation they deserve some genuine credit. While Panasonic took a still photo sensor and stuck it in a video camera, Sony really did create a large sensor video camera.
Meaning -- no -- this "24.3" megapixel sensor is in no way the F3/FS100 sensor and video from it will not be the same. Sony has a thirty or forty minute presentation about the development of the F3/FS100 sensor online somewhere -- perhaps someone can post the link.
Yes, it would be nice if, two or three years later, Sony has a response to the 7D, and yes it would be nice if that response didn't have the problems of the "first generation" Canon HDSLR cameras. And, this A77 may (note: "may") produce some nice looking video. But -- it's absolutely not the F3/FS100 sensor and you should not expect it to be "on par" in terms of video -- in the exact same way still photos from an F3/FS100 wouldn't be "on par" with an A77.