My experience with KEF is with their Reference 2C center channel and it's an engineering masterpiece. Low distortion, gorgeous looks, perfect dispersion, and a little sterile (2D sounding). It won't hide the truth and nothing about the sound will be "full sounding" unless it's in the original recording. The new R-Meta should not be too far off from the non-meta Reference 2C.
While not often discussed I believe the raw driver CSD sonogram may be why some speakers sound fuller than others. While the KEF reference (ribbed aluminum), Seas Excel Magnesium, and Accuton Cell sounded more similar than different to my ears while Dynaudio poly sounded significantly fuller but lacked ultimate clarity. To keep this science and not just subjective here is the sonogram of the SBAcoustics SB15NBAC30-8 (ribbed aluminum) and SB15mfc30-8 (poly) which share the same motor.
While not a direct comparison between KEF and Focal that you asked for the short answer is KEF is engineering perfection. The Focal at best may subjectively sound fuller with their flax cones which are likely not as clean as aluminum's CSD. Focals dispersion will not be up to par, your wife on couch A will not get the same experience as you on couch B.
Before leaping at something this expensive you really owe yourself an
audition. Many will tell you that dispersion, THD, and estimated in room response are everything it can be misleading. They are very important performance metrics with an audible result however my experience with hard cones vs softer cones was more audible.