Don´t trust the first German reviews. Not professional and only from stores.
Here in German stores it´s normal, that picture signal is only SD and even with HD split on many further TV´s and the TV isn´t well calibrated.
I never saw a perfect SD and HD picture in a store. My three years old LCD-TV Samsung LE-40M51 make a better SD picture than all LCD-TV´s in such stores like "Media Markt" and "Saturn". And the new SPVA-Panels are so much better than my old Samsung.
They are often all in "Shop Modus" with dynamic contrast and bad colours and picture signals.
The XS1 is much better than these first "reviews" want make you to believe! Wait for professional reviews and calibration.
Off course, the best bang for the buck ist the A950, but even close to the X4500 and in some disciplines better, it isn´t the best LCD-TV out there. I believe that´s the XS1.
We all hope, that in spring 2009 Sharp is coming soon with cheaper versions of the techdemo XS1. Probably without RGB-LED´s and colour dimming and in a cheaper and more thickly finish. But white LED´s like in the A950 (blue small LED + red and green phosphor) are good enough for good colour calibration and it´s so much cheaper to build. The XS1 isn´t a mainstream product. It´s too early for this technology to come down in prices.
Don´t understand this TV as an ordinary TV! It´s a techdemo of what is today possible with consumer LCD-technology for a high price. For Sharp probably a technology carrier for the next 2 years.
For an ordinary consumer (J6P) the difference to the A950 aren´t high enough, but for the critical consumer it could be some subtle differences, which justify the price. Not only the picture quality, likewise design and build quality.
What we can say, 2008 it´s the end of the CCFL-LCD´s and the beginning triumphant advance of LED-LCD-TV´s over CCFL-LCD´s. Next year other brands will follow Samsung, Sony, Philips and Sharp and cheaper models will come; - LG, Toshiba and JVC. The Samsung B650-Series could be the next mark for cheaper LED-LCD´s...