Hate to be a buzz kill, but what you mean is "if the S2 were currently a production product it would be the fastest production medium format system".
I think it's kind of silly to assume that neither Leaf, Phase, Sinar, nor Hasselblad will have any new products released by the time the S2 is shipping in any real quantities.
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The most asked question I hear from photographers is will Nikon or Canon make a medium format sized camera. I think all of us know they can and obviously both have made optics for about everything, so making a lens line large enough to cover a 645 frame wouldn't be a leap. Actually I don't think anyone believes Canon or Nikon can't build any camera they want, if the market is large enough for profit.
What is interesting is nobody asks about a Canon or Nikon because they dislike the image quality from their digital backs, they just want the same usability and ease in medium format they have with their dslrs and the real truth is the dslrs have gotten much better and much easier to use, while medium format still struggles with in camera processing, readable lcd's and in a lot of cases software development.
The Leica seems interesting, but it also seems one step back even before introduction. Yes Leica glass can be nice, (also it can be problematic when the quality control falls down which happened a lot with the M8), but I seriously wonder if the world is really waiting for a low iso ccd camera with semi slow lenses for two or three times the cost of a d3x or Canon 1ds3?
The Leica seems more of an enthusiasts camera than a working photographers tool, but I guess they will sell I just wonder how many.
If Leica does aim the S2 at the professional it needs to get past the usual medium format business model of slow deadlines and wait and see product. It must come out on the shelves working, with full lenses, software and in rentals or it will be like the HY6. A nice camera that becomes buried in a niche market.
Now on the flip side of this, if Leica had annouced that this camera had a 920,000 pixel lcd, would tether to robust software, went to a real clean 800 iso, looked like film out of the camera and had fast lenses all in the F2 minimum range I would take a hard look. Actually I guess I'm saying I'd like a d3x with a leica logo and a larger frame size, or even better put a pentax 6x7 with an endless roll of film. Saphire glass doesn't really turn me on.
Or even better if Leica had annouced an M series with a cmos sensor or 17 to 20 mpx, and autofocus lenses, I'd write the check today.