Here my review, from Italy.
My 50c6500 have a buzz. I've send back my set and now I'm waiting for a new one.
Tomorrow morning it will arrive.
During the three days that I get mine, I was very happy in PQ with SD signal. The 50c6500 did a very good job: very good scaler and very good deinterlacer.
Black: blacks looked absolutely grey. Grey, not dark grey
I did a fast calibration with MERIGHI DVD (this is a dvd with some signal test done by Merighi, one italian engineer) and I had to set the brightness at 58 (in italian 50c6500 the brightness starts from 0 to 100). Below 58 my set lacks the shadow details.
But also at 45 the blacks were grey, absolutely grey.
This is a beautiful tv but the blacks are very bad.