I purchased a 60PB6650 last week to replace a Panasonic 50U50 plasma (we wanted a larger screen).
The LG 6650 has excellent color and low luminance and chroma noise levels. But the "black level" should be called gray level. An inexpensive JVC 32" LCD and a Sony 40" LCD in other rooms have noticeably better black levels than does the LG. The Panasonic U50 that I had intended to replace is better still. The final-generation Panasonic 65S60 that is in our theater room is in another league altogether.
Compared with the other TVs in the house, especially the Panasonic plasmas, the LG has a washed out appearance that is difficult to watch. Yes, I tried every adjustment possible, but the LG simply cannot display blacks. Gray, sure. Black, no.
Then, on Day 2, the 6650 developed a pink tint about 10" high x 4" wide on the right side of the screen. On Day 3 a slightly smaller area of pink appeared on the left side. Days 4 and 5 brought pink areas on the bottom, top, and center.
The LG has turned out to be a major disappointment. I am returning it.
I chose the LG over the Samsung 60F5300. But last night I placed an order for the Samsung. I hope it performs significantly better than does the LG. If not, the Panasonic U50 plasma goes back into service.
Oh, how I wish I had purchased a Panasonic 60S60 when they were available.