i'd disagree. I have the 50" version of the panny with windows shining directly on it and glare is not too bad. Personally, i'd take a little reflection and glare any day over a washed out picture. You'll appreciate it much better when there is no light. Colors and contrast are much much better on the panny. They have one side by side at the sears here locally and it's no contest. However... the 650 is a whole different animal. =)
at the best buy we have here they have all the 40" class tv's sitting side by side and what i've always noticed is that during the daytime when it's very bright, the only picture you can see are the panasonic plasmas. Everything else gets washed out by the light. But eh... you should go the the store and judge for yourself. =) good luck! you'll be happy with either set.