I have an Lg signature oled UHD tv and a maranz pre amp AV8802A and i also have the panasonic Ub900 UHD 4k bluray player and i have had the Oppo 203 4k bluray player for a few weeks , i had my cousin come over who also has the panasonic , ran both through my pre amp , then ran both through the HDMi on the tv. The 203 picture quality was much sharper and colors much more vibrant me cousin were in aww, 203 was a little better in upscaling also , looking forward to the 203 dolby vision capability's once that happens its game over, panasonic isn't able to uprade to dolby vision . So we compared the sound , with my pre amp having a 32 bit akm processor and the Oppo 203 has a 32 bit processor also , sound stage was fantastic , the panasonic was good but not great we played some DVD audio disc, Super CD 's some of my High quality apple files that are un compressed also sounded fantastic , the panasonic Can't play any of these . Though the panasonic is a good UHD 4k bluray payer , i have it boxed up for my son to pick up and enjoy, will be getting an Oppo 205 in a few months the 203 will be going in the bedroom .