I, too, find that the CFX and C7 pianos are really 'thin' , it was a disappointment for me, as it was a big selling point of the Genos (but, hey, as someone else said "Marketing is all about selling the weakest point as the strongest one")
In a mix, they do their job, but when played alone they lack depth, resonance and richness. I tried to tweak them a little bit, adding some sustain, playing with the DSPs, but ironically I found the 'Grand Piano' in the 'Legacy' section more convincing ...
A lot of things were already said about the 'thin' piano sounds of the Genos - I won't repeat them here, just seach in this forum - but the Montage got a new Bosendorfer Piano sound available to purchase (it is even free for MODX owners !). Will Yamaha make a Genos version ? Probably NOT.
The Montage received several Firmware update, some of them added major enhancement : the 2.5 version added a lot of new sounds : the entire Motif line sounds being one of them, they even added new effects ... , in contrast the Genos received some firmware update , mainly to correct lots of bugs, but not really adding major features (except 'Audio multi recording' in v1.10 and 'Voice Guide' in v1.30 which is really great for visually impaired people, but the Genos OS being at its core a Linux kernel, I guess that Yamaha did not have to create something really new and specific to support this functionalty -
only my guess, not a fact - ) the search feature is what I consider to be the biggest 'new feature' added by a Firmware Update on the Genos... A nice thing, but not a game changer...
There's still several bugs left uncorrected (again, I won't repeat them here) , and there were no update since April 2018... I still hope for a new Firmware, but my hope fades as time passes… Wait & see...