I just got my w1080st and just like OP, I see serious issues with inconsistent focus and brightness across the screen.
Using the test pattern, you can get to a point where entire screen is some what in focus (not super crisp) and in that mode you wont notice any focus issue while watching movie - due to color and motion.
When I connected my HTPC and opened windows explorer (or browser) with screen full of text on it, I could see all the text blurry. When I tried to focus, I could get either center of the screen OR top left of the screen super crisp - but not both/entire screen. If the top left is crisp then center of the screen is extremely blurry and vice versa.
I have already tried Optoma HD25-LV and returned it the same day due to very dim and non-rectangular image. I have an old Epson 8350 (2+ yrs old) which is unbeatable by any of these latest projectors, except it lacks 3D.
I am planning to get Epson V11H501020 hoping it is as good as 8350 for 2D.