So I got my Sony HW55 today, and guess what? I'm seeing the same issue. I couldn't get a picture to show it well, but what I see is a large central circle that looks greenish, and things get progressively more red/pink the closer I look to the screen edge. With a 60% gray pattern, this was very noticeable. See the attachment for a crude drawing.
I moved my meter around the screen, and it verified what I was seeing. The left side of the screen was a little redder than the center, while the right side was more red than both. I'm not sure if the center was really green, or it just appeared that way since it was surrounded by too much red. The left 1/4 or so of the screen measured 88% red, the center measured 85% and a good portion of the right side measured 92% red. Being new to projectors, maybe they all have this to some extent. To me, this is totally unacceptable for three grand. I can go spend that same money on a 4K TV, and it'll show a gray screen that's gray.
Anyway, sorry for venting, but at this point I've bought and returned two projectors due to whites looking pink, and also returned a few screens due to quality issues. Very frustrating. Maybe someday I will try a projector again, but for now, I'm going back to TVs. Good luck to the rest of you who've encountered this problem!