Well, for the benefit of others:
There is some difference of opinion as to how far away you should be for given display sizes.
The "Grand Alliance" goes with 30 degrees (SMTPE) viewing angle, or about 3.3 times the display height.
A more conventional view is THX, 36 degrees or between 1.5 & 2.5 times screen width.
Electrohome recommends somewhere between 3 and 6 times the display width.
So for a 52" diagonal display, you get recommendations of 7 feet, 5.7 to 9.4 feet, and 11.3 to 22.7 feet, respectively.
What really matters is what looks good to YOU. No unquestioned "best" viewing distance. FWIW, I have a 61" that I view about 12 feet away.