I've got a Panny VT30 and the M801D and the VT30 has better PQ, less ghosting, flashlighting, deeper blacks, great viewing angles and I can use it as a heat source in the winter. That said, I still watch sports and play games on the M801D. The differences are subtle and I can turn my brain off pretty easily to not care. You've got to see them side by side to determine if you can do the same.
There's another thread where a member reviewed an extensive list of available 80"+ LCDs and finally decided on a set that was around $10K. I'll post the link when I get home if you don't find it first.