Strangely enough, I never noticed the keys were smaller, but I never was a piano player.
I did, of course, notice that the Roland G800 keys were totally different, but they were too hard for me to play--made my fingers sore.
I played quite a few Technics models and didn't notice the difference. And I have big hands too. Maybe I'll check out some other brands when I get a chance, just to see if they are easier to play. I'm looking for reasons not to buy Yamaha, but so far the pluses have out-weighed the minuses.
DonM