The Samsung F8500 is the brightest plasma TV ever, and is even able to challenge some LEDs. While its blacks don't beat plasmas from Panasonic (like the ST60), they are still very good. The only downside is the anti-glare filter produces some slight horizontal dark lines.
Without a doubt, Samsung has created the best plasma TV for use in bright rooms. The Samsung F8500 Plasma TV can get almost twice as bright as the competitors while still maintaining a respectable black. There is pretty much no downside to this TV. If it is within your budget, it is a no-brainer.
The F8500 has deep blacks and good detail in the shadows. However, it is about the same as the lower-end models from Samsung. Also, the Panasonic ST60 performs slightly better in a dark environment for a significantly lower price.
The horizontal viewing angle is really good, but its vertical one is limited by its anti glare filter to about 30°.
When setting the input type to PC, the input lag of the F8500 is very low.