Panasonic ST50 vs GT50

[v_squared123]

I sold my 58VT25 plasma and now I'm looking for a new tv. I was very disappointed when the black levels rose after 200 hours of use since the tv was a late July 2010 build and those models were supposedly had the fix to rise after 1500 hours. Now I'm looking for a newer model that completely walks over the vt25 series image quality and I'm starting with the ST50 which had better black levels and better color accuracy than my old VT25. Fascinating how quickly advancements in technology can happen. I'm looking at the ST50 and GT50 right now.

Has it been noted if there is an visible advantage with the 24,576 shades of gradation in the GT\VT vs ST50 plasmas? I looked into all Major reviews of each tv and no one mentioned tHey could see a benefit having the extra gradations. Anyone owners out there feel like they have seen a benefit with the extra shades?