I am in the same boat as you ghostface, although I am trying to decide only between the 2 Pannys. You're probably not going to get much specific information on the C1. I have struggled to find anything at all, other than 1 or 2 reviews.
To try to help with your question, everything I have ever read says Panasonic is #1 in terms of plasma (with the exception of Pioneer -$$$). My Dad has a 58" Panasonic plasma and I can verify it is amazing - movies, games, sports, etc. The only games I have tried on it were from a PS3. Uncharted: Drake's Fortune on that tv is the best looking game I have ever seen. I played through the whole thing and was still in awe of the graphics by the end.