Entre otras cosas, según dice ese preview test, parece que el contraste nativo es el mismo que el del 4000, aunque el dinámico es ahora mucho mas agresivo sin ser molesto...

cita:
"However, progress has been made in terms of contrast: While the native contrast is compared to the previous stable at about 3200:1, but the real-time adaptive aperture in this mode, much more "aggressive" program than even the PT-AE4000.

The iris regulates the function of the image content of luminous flux, making it possible to improve the black levels in dark scenes without compromising the maximum brightness in daylight scenes. Since the Panasonic version is very fast, no delay or disturbing picture pumps can be seen. With it reaches the PT-AT5000 a 60,000:1 dynamic contrast ratio of approx. This allows a very good balance between good black level and an appealing lightness."