Made the same comparison myself last week and I agree with you. On close up, the blurring is heavy pixelization. WSPA looks "flat" and out of focus as well, especially when the scene changes. I have emailed them; no response.
SEC football last year was reference quality on WSPA and WBTV reminds me of that. Sunday Night football on WYFF (NBC), however, is the best football PQ to me this year on my Sony Ruby and 106" ST130.