So what is it that makes you fall in love with live view?
If you've ever shot a 5d2 on semi static subjects, it's almost a no brainer to hit focus. Frame, two quick push buttons and you've zoomed into eyelashes, set the focus push the button and shoot.
Digital is hard to focus and live view takes a lot of angst out of hitting focus and of course the beauty of the 5d2 is what you see is what you get.
Now in regards to the Sony.
I don't think this Sony is amazing because of quality or features but for still photography it does change the game.
Nobody would have thought even a few years ago that a company would make a 20+ megapixel camera under $2,000, much less one that is coming out with a new lens set of Ziess lenses.
I have a friend that's moved 95% of his work away from medium format backs to the Sony a900 and hasn't missed a thing and his work is in most major publications monthly.
Right now we're into this strange middle territory where 35mm cameras have gotten very close to the file quality of any medium format back and with the Sony's, Canons, maybe soon the Nikons they are not doing it for 1/2 the price of past 20 megapixel cameras but now 1/10th and I doubt seriously if shot in professional conditions, once an image goes through post production few buyers of photography at any level, any genre could tell the difference between this camera and any other, from $7,900 Nikons, to $40,000 digital backs.
I know nobody wants to hear this, but Sony has quietly moved into the market. A few years ago at Photoplus they still had 1.5 cropped consumer cameras though mounted on the front was big honking Ziess glass, so you just knew the day was coming where they would go head to head with everyone.
They obviously weren't making those lenses for the amateur down the street.
What does amaze me most is the video functions of Sony and even Nikon and Canon seem somewhat stalled. Sure there's live view generated 720 to 1080 high def, that require manual focus, shoot some form of camera processed video and though the quality and look can be quite amazing, they are still limited in their use and scope.
You would think Sony would be way ahead on this, given their experience in video and already have at minimum a cine full frame camera with a serious lens set, that shot a raw file, Kind of a poor man's RED.
Imagine if their next video camera was compatible to their still lenses, then the game really get's changed and honestly it would be hard to ignore a system, that might require two cameras, but all the other parts, especialy glass were interchangable.
Regardless of video, or where Sony lens line is at the moment, it is very hard to ignore what they have recently done and you just kind of get the feeling that when they are ready they could change everything.
It really depends on how fast, how good, how soon.