Money didn’t really come into the equation with my decision in purchasing the sx900. I sold over $6k’s worth of keyboards and replaced them with 2 ( sx900 and the p121 ) which ended up costing less than half.
Didn’t need the extra knobs, sliders, keys, etc that the Genos had to offer. Operating system appears to be pretty much the same.
Use piano sound for melody for probably 90% of what I play, so aftertouch not that important.

If I’d had the opportunity of picking up a really good second hand one , with a warranty thru one of the stores, ( chance of that , big fat zero) I probably would have been tempted,
but paying well over double the price of the sx900, plus having to add the price of a good set of speakers, value wise, just didn’t add up.