In the first comparison (your own photo), it's the W905 that is showing yellow
. The BenQ, on that photo, does not show yellow, but lime green
In regard to
There is another photo, some other guy did with his 55w905a on the left http://fotkidepo.ru/?id=photo:904646
. It's not a clear representation of what i'm seeing, but at least close.
this one seems like the W905 has much few light output than the other one. Did you go into system settings and have disabled the light sensor in the Eco menu? When compairing to other displays, it definetly should be off. If backlight is lower on one one panel compared to another (in this case due to Eco light sensor), the picture often is described as "dull", "lifeless", "has no punch", and whatnotelse, even if it's just reduced light output. - Just turn the light sensor off, and probably your yellow will be so punchy and saturated, yummy!
Another point is -- viewing angle, indeed. The characteristic of the W905 panel is that of the RGB matrix, the green channel is losing contrast a bit quicker than the R and B channels when viewed from an angle. This is the reason for the "pink tinge" that is often talked about, and it will also affect colors like full-green (becoming more yellow) and yellow shifting a bittowards orange and become darker. Problem is, when you have two sets side-by-side, than you always deal with some kind of off-angle viewing.
On the positive side, it seems your W905 has pretty good screen uniformity. Compared to other W905' panels, there seems only very minor signs of "fingers" ate the left/right edges, or DSE/banding over the screen area. Seems like a lucky hit!