Hi Mark
Smudge never seems a problem with plasma unlike LCD. To be honest I have never seen this effect on plasma. I have watched some very fast action ie martial arts fighting, super fast rapid camera pans in action TV/movies, never seems a problem on my Pioneer. I expect the same with panasonic, i remember it looking fine in a shop when the Rugby was on.(I'm not much of a football fan) If you have sky, get Sky HD....more than improvement in sharpness it seem the high bitrate on HD channels virtualy removes all digital artifacts (ie Blocking) on complex fast moving picture that you would see in low bitrate SD channels. (how ever even though DVD is SD, you never really see digital artifacts because of much higher bit rate) Beaware that there is only limited HD content on SKY, and even sky-oneHD , several programes are not genuine HD, just upscaled. Aleast SKY lets you know which ones are true HD , by putting a HD symbol when you press programe infor button or use the TV guide listing. despite this I still think its worth the extra £10 pm.
just for your information SD is 480i/576i. HD is 720p, 1080i, 1080P
Nishan