About the viewing angle: 16 degrees is very small and wouldn't really make a difference unless you were viewing the display from maybe 10 feet or farther away.
Just because something is a higher model number doesn't necessarily mean it's a better display. This is typically the case, but not always, so it's not safe to assume it's better.
You are probably right about why there are no reviews. Makes sense to me, but as with anything there are always other possibilities.
To determine whether the display is 6 or 8 bit, check if it can display 16.2 or 16.8 million colors.