I've owned a Tyros 3,4,5, and now Genos.. Each to me has brought a 15% - 25% improvement, maybe more, maybe less. Others might feel different. Each has noticeable improvements, not mind boggling. If $$$ were tighter, I might have been tempted to skip a generation. But Yamaha's top arrangers, bring me such joy, excitement, and challenge (in a good way) to play. Now i don't buy computers as fast as I used to.. Used to get a new one every 3 years, now I go 4 - 6 years to save money.
Yes, there is a certain 'pride' in having the latest and the greatest.. I used to have a lot of synths, kbds and upgraded them often, now retired, my income is not as much.. I will sometimes pull out an older, kbd, module, and see if there is something new I can find in it.
If you have the $$$, get the Genos.. I was not as 'overwhelmed' when I got at first. I did not feel a huge improvement. But after a month or two, I knew I made the right decision.. For each of us, it is different. I have gone on not too many 'vacations' in my life. I preferred to have $$$ for new computers, and musical hardware. that brings me great joy.