I just bought the 55" GT50. I originally had the Samsung PN51E7000 Plasma for about 3 weeks but had issues with IR and poor black levels. My 4+ year Samsung LCD had just as good blacks and very similar colors. I will have both TVs for the remainder of the week so I did some comparisons yesterday. Overall I like the GT50 better but the Samsung does come on top with a few things. I made a long post here: http://www.highdefforum.com/1295847-post8.html
about the two TVs. Be advised though that I am not too well versed on HDTVs so my terminology may be incorrect and my opinion may differ from others. Here's a condensed version of the post from that site though:
My camera wasn't able to accurately capture the colors so don't pay too much attention to that. I was able to set the ISO and exposure to settings that accurately captured the black levels though.Clarity
- Samsung wins. Look at the leaf picturesMotion Handling
- Panasonic wins ONLY if Motion Smoother is on, but with it on it can cause ghosting at times.Bright Room Viewing
- Samsung wins. Panasonic has a weird green hue to the panel itself as can be seen in the first picture. This makes bright room viewing bad on the Panasonic as dark areas will be that color. It also gets more washed out and reflects more with a lot of ambient light.Colors
- Tie. Samsung was more vivid and Panasonic was more dull. Somewhere in between would be perfect but I couldn't seem to get either TV to my liking.Blacks
- Panasonic dominates here. It is ridiculously black as you can see in the pictures but it does lose detail in really dark areas. I turned the brightness up and got the detail back but lost the DEEP blacks, although it was still very very good. Due to this, the Panasonic looks a lot better at night then the Samsung.Buzzing
- Samsung was about 1.5x louder but neither of them were so loud that it was audible over normal listening volume.Image Retention
- This was a big problem on the Samsung. I wasn't able to really test this on the Panasonic since it was smart and never allowed a static image on the screen for too long like the Samsung does. So the win goes to Panasonic.Features
- The Panasonic couldn't play either of the two movies (mkv) off a USB stick that I tested with. This is bad as I use USB all the time. Samsung had no issues with any of my movies or shows. The Panasonic did have small things that made it better such as cable wraps, SD Card reader, IR protection, and a few other thingsConnectivity
- Panasonic had 1 more HDMI, 1 more USB, SD card reader and a VGA port.
I plan to run D-Nice's slides and try out the settings as well to see if I can get any improvement. I will only be able to run them for about 48 hours though before I'll have to return the Samsung.