|◯, Δ, and x are assigned in descending quality order.|
Incidentally, SonyAlphaRumors publishes that the next generation Sony full-frame ILC might feature RGBW CFA under "impossible rumors" title:
"The Sony A7S III that will be announced next spring will be the first interchangeable lens camera featuring a RGBW sensor. This will result in an sensitivity increase of 84%. Additional improvements and the cooper wired backlight sensor will result in a total of over 1 fstop of noise improvement."