raagamuffin She quite liked the Cunningham (so did I) action and it's sound. We could discern differences in sound quality between 5 and 5'10 (which she wanted but too big for our space). Couldn't hear any variation between 5 and 5'4.
Ahh, ok this changes things. I have not played a Cunningham myself, but they are quite well regarded and a friend of mine has one. I'll message her and ask her the size.
I suspect the diff between 5' and 5'4" is indeed going to be very minimal. But yes, going from 5' to 5'10" is a going to be a big difference. Since that piano is too big for you, don't play it anymore I'm only half joking. Early in my own piano shopping, I played anything and everything, include pianos that were too big or way over my budget. It was instructional early on but I eventually started only playing things that I could actually afford or that would fit.
Back to your pianos.... I never met an Essex I liked (sorry!) and I played a fair amount while shopping. The Kawai GL pianos would be fine, I assume, but if you both liked the Cunningham, then I think you should give that one serious consideration.
I'll post again later, gonna go message my friend!