I've paid a huge amount of money for a 4k oled TV and I've noticed that the blacks are more grey in normal light conditions and when in low light the picture just isn't what I was expecting from an oled - when anything fades to black or there is a large area of black on an image I notice that there are extremely black semicircles at the edges while the middle portion of the screen is a washed out grey that is not uniform in colour. Does anyone know if this is normal? I sent my LCD 4k back because of washed out blacks and blotchy backlighting but that TV cost me a quarter of the price of the oled, so I'll try and get a refund is this is what to expect for that kind of money.