Just received the new Sharp LC-70LE757U last week. Got it before Sharp even had the product page up!
A small down side is there is minor flashlighting on black screens and washing out on side viewing, but that is to be expected with a panel at this price point. If I wanted perfect, I would have spent 7 grand instead of 2500 for a 70 inch or got a 65 inch plasma.
But since there are news stations on the screen much of the day, Plasma was out of the question.
Despite the shortcomings (they are avoidable since I view from center and keep the backlight low while viewing movies anyhow) I have found the picture to be stunning and very accurate.
After a week of calibrating, I have found these settings to be ideal and as close to ISF as possible.
Edit 5/9/13: I have updated calibration settings. Looks MUCH better than my first shot at it:
AV MODE: MOVIE
Color Gamut Range: Standard
Color Temp: Low
[10 Point Setting Off]
R Gain (LO): +3
G Gain (LO): +5
B Gain (LO): -2
R Gain (HI): +4
G Gain (HI): +6
B Gain (HI): -10
[10 Point Settings: No adjustment]
Motion Enhancement: 120Hz High (240 and 480 resulted in a darker degraded picture)
Quad PIxel Plus 2: off
Active Contrast: Off
Gamma Adjustment: -1
Black Level: [grayed out]
Film Mode: Off
Digital Noise Reduction: Off